Aggressive man in church trapping female bird (9)
I believe the answer is:
bullfinch
'bird' is the definition.
(bullfinch is a kind of bird)
'aggressive man in church trapping female' is the wordplay.
I cannot quite see how this works, but
'man' could be 'bull' (bull is a kind of man) and 'bull' is present in the answer.
'in' is present in the answer.
'church' could be 'ch' (abbreviation on maps etc) and 'ch' is found within the answer.
'female' could be 'f' (abbreviation) and 'f' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bullfinch that I've seen before include "Bird with pink-breasted male" , "hedge" , "Bird that eats fruit buds" , "Common garden bird" .)