Bird wing seen by fisherman? (10)
I believe the answer is:
flycatcher
'bird' is the definition.
(flycatcher is a kind of bird)
'wing seen by fisherman?' is the wordplay.
'wing' becomes 'fly' (synonyms).
'seen by fisherman?' becomes 'catcher' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'fly'+'catcher'='FLYCATCHER'
Can you help me to learn more?
(Other definitions for flycatcher that I've seen before include "Bird" , "airborne killer" , "sticky leg trap" , "one that may be spotted singing" .)