Winger seen in Scouse line-up (5)
I believe the answer is:
ousel
'winger' is the definition.
(ousel is a kind of bird)
'in scouse line-up' is the wordplay.
'in' says the answer is hidden in the clue.
'OUSEL' can be found hidden inside 'scouse line up'.
'seen' is the link.
(Other definitions for ousel that I've seen before include "Dark-faced type of yore" , "Old name for a blackbird; also a kind of thrush" , "Louse turned out to be a thrush (5)." , "Flyer" , "Former name for blackbird" .)