Crossword Genius

Envelope part (4)

Ross

I believe the answer is:

'envelope part' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for flap that I've seen before include "Tab - tizzy - move wings" , "Minor panic; tab" , "Fluster" , "Adjustable part of wing - panic" , "Moving surface on wing" .)

I've seen this clue in the Penny Press, The Star Tribune, The Mirror and the King Feature Syndicate.
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