Winger's reminder to cover both sides and find width (6)
I believe the answer is:
curlew
'winger's' is the definition.
(curlew is a kind of bird)
'reminder to cover both sides and find width' is the wordplay.
'reminder' becomes 'cue' (I've seen this before).
'to cover' indicates putting letters inside.
'both sides' becomes 'rl' (I've seen this in other clues).
'and find' says to put letters next to each other.
'width' becomes 'w'.
'cue' placed around 'rl' is 'curle'.
'curle'+'w'='CURLEW'
(Other definitions for curlew that I've seen before include "Bird with long down-curved bill" , "Shorebird with long down-curved bills" , "Wader with curved bill" , "Large wader of the sandpiper family" , "Large shorebird" .)