The word, as suggested by the saying formed by the ends of this puzzle's four longest answers
Else clues• ___'s the word
• The word, to secret keepers
• The word
• At times it's the word
• Autumn blossom, briefly
• Big bloom
• Britain's Queen ___
• British family member
• British mother
• British parent
• Buttoned up
• Clammed up
• Close-lipped
• Close-mouthed
• Dad's mate, in Dorchester
• Daisy's cousin
• England's Queen ___
• Fall bloom
• Fall flower
• Flower, for short
• Hardly blabby
• Hastings household name
• Having sealed lips
• It may be the word
• It might be the word
• It's the word
• It's sometimes the word
• Manchester mother
• Maternal flower?
• Member of a British family
• Mother, in Motherwell
• Mother's flower?
• Not blabbing
• Not saying a thing
• Not saying a word
• Not speaking
• Not talking
• Not verbalizing
• Ornamental flower, for short
• Oxeye daisy, for one
• Queen ___
• Quiet
• Saying nothing
• Short flower
• Silent
• Speechless
• Taciturn
• The word, if you're silent
• The word, maybe
• The word, often
• The word, sometimes
• This is the word
• Tight-lipped
• Tight-mouthed
• Uncommunicative
• Unspeaking
• With mouth shut
• Of China
• Informal terms for a mother
• Secrecy