Blokes in British bird group showing confusion (10)
I believe the answer is:
bemusement
'confusion' is the definition.
(I know that bemusement is a type of confusion)
'blokes in british bird group' is the wordplay.
'blokes' becomes 'men' (I've seen this in another clue).
'in' is an insertion indicator.
'british bird' becomes 'bemu' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'group' becomes 'set' (both can mean a collection).
'bemu'+'set'='bemuset'
'men' placed within 'bemuset' is 'BEMUSEMENT'.
'showing' is the link.
(Other definitions for bemusement that I've seen before include "stupefaction" , "Confusion, bewilderment" , "state of perplexity" .)