AEIOU

Facetious five?

• ___ and sometimes Y

• 'Facetious' feature

• (missing clue)

• 20 Y sometimes joins them

• 5 of 26

• Abecedarian's group

• Abstemious quintet?

• Airy group

• Alphabet quintet

• Alphabet set

• Alphabetic device used by Frederick III

• Alphabetic pentad

• Alphabetic sequence

• Alphabetical fivesome

• Alphabetical quintet

• Basic quintet

• Bit of kindergarten learning

• Buyable letters on Wheel of Fortune

• Common quintet

• Common sequence, each member of which appears exactly once in this puzzle's long answers

• Elementary fivesome

• Elementary quintet

• Elementary school quintet

• Elementary school teaching

• Elementary sequence

• English quintet

• Facetious fivesome?

• Facetious group?

• Facetious quintet?

• Facetious, half-serious, abstemious quintet?

• Familiar fivesome

• Familiar quintet

• Five essential things to become facetious

• Five of 26

• Five of a kind

• Five of a kind, alphabetically

• Five of twenty-six

• Five things you need to be facetious

• Fivesome found in the five Tony winners in this puzzle

• Fivesome seen in order in the answer to each starred clue

• Fundamentals of speech

• Grade school quintet

• Group often seen near the Y?

• Group seen in late-night hours?

• Group that sometimes includes Y

• Group to which the Y is often linked?

• Group with a Y, sometimes

• Half-serious run?

• Kindergarten quintet

• Language quintet comprising the only elements in the circled boxes

• Letter group

• Letters before and sometimes Y

• Letters from grade school

• Letters that must be bought on Wheel of Fortune

• Linguistic pentad

• Low-count Scrabble quintet

• Most of the theme of this puzzle

• Necessary letters

• One-point Scrabble quintet

• Open-mouthed quintet

• Original set of marshmallows in Marshmallow Alpha-Bits cereal

• Phonics class quintet

• Phonics lesson quintet

• Purchase options from Pat Sajak

• Quintet before and sometimes Y

• Run in grade school

• Run of vowels

• Run that sometimes includes Y

• Run with one's mouth open?

• Second letters of this puzzle's five theme answers (seen in order)

• Second-grade sequence

• Sequence found in this puzzle's five longest answers

• Sequence sometimes ending in y

• Sequence that may end in y

• Sequence with a Y, sometimes

• Series that may end in y

• Sesame Street quintet

• Sometime colleagues of Y

• The facetious five?

• The five vowels

• The vowels

• Theme of the puzzle

• Things purchased from Pat Sajak

• Useful quintet

• Vowel group

• Vowel quintet

• Vowel run

• Vowel sequence

• Vowel string

• Vowels

• What 'buying a vowel' contains, appropriately

• Wheel of Fortune buying choices

• Wheel of Fortune buys

• Wheel of Fortune purchase choices

• Wheel of Fortune purchase menu

• Wheel of Fortune purchase options

• Wheel of Fortune purchases

• Wheel of Fortune quintet

• Y's associates?

• Y's half brothers

• You'll find them all in a tennis court