Circular snares trap bird (10)
I believe the answer is:
flycatcher
'bird' is the definition.
(flycatcher is a kind of bird)
'circular snares trap' is the wordplay.
'circular' becomes 'flyer' (synonyms).
'snares' is an insertion indicator.
'trap' becomes 'catch' (catch can mean to trap or apprehend).
'flyer' placed around 'catch' is 'FLYCATCHER'.
(Other definitions for flycatcher that I've seen before include "Bird" , "sticky leg trap" , "one that may be spotted singing" , "airborne killer" .)