Small flap; tally (3)
I believe the answer is:
tab
I believe this is a double definition.
'small flap' is the first definition.
(I've seen this in another clue)
'tally' is the second definition.
(thesaurus)
(Other definitions for tab that I've seen before include "Tally at bar (colloq.)" , "Ring pull" , "Tally of orders in bar" , "Tag" , "Kind of label for bat" .)