Flap the wings (7)

I believe the answer is:

flutter

(Other definitions for flutter that I've seen before include "Small bet; beat feebly" , "Move one's eyelashes - move like a butterfly - bet" , "Bat" , "Fly unsteadily; small bet" , "Informally a slight gamble as on a horse" .)

I've seen this clue in The Mirror.

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