Fall for a bird (7)
I believe the answer is:
swallow
This clue is a double definition.
'fall for' is the first definition.
(thesaurus)
'a bird' is the second definition.
(swallow is a kind of bird)
(Other definitions for swallow that I've seen before include "Bird - drink" , "Fork-tailed bird" , "put up with" , "One doesn't make a summer, they say" , "Buy < and consume" .)