Descent, as of an airplane, 5 letters
Arrive at a bad time, say, 6 letters
Make a surprise visit, 6 letters
Pay an unexpected visit to, 6 letters
Surprise with a call, 8 letters
Fall in exchange rates?, 13 letters
*Too-small quantity, 15 letters
Insignificant amount, 15 letters
Nowhere near enough, with a, 15 letters
Something insignificant, 15 letters
Nothing much, to scuba divers?, 14 letters
Something insignificant, 14 letters
Change the subject already!, 6 letters
Change the subject!, 6 letters
Don't argue anymore, 6 letters
Don't beat a dead horse!, 6 letters
Enough!, and a hint to this puzzle's six theme entries, 6 letters
I said that's enough!, 6 letters
I'm sick of that subject, 6 letters
Order to a gun toter, 6 letters