Tolerate a bird (7)
I believe the answer is:
swallow
I believe this clue is a double definition.
'tolerate' 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 "put up with" , "Bird - gulp down" , "One doesn't make a summer, they say" , "One of these does not make a spring" , "Fall for; bird" .)