Skin from wee fish (7)
I believe the answer is:
peeling
'skin' is the definition.
(thesaurus)
'wee fish' is the wordplay.
'wee' becomes 'pee' ('pee' can be a synonym of 'wee').
'fish' becomes 'ling' (ling is a kind of fish).
'pee'+'ling'='PEELING'
'from' acts as a link.
(Other definitions for peeling that I've seen before include "Skinning" , "Removing the rind" , "Removing skin" , "Shedding skin" .)