Could roe possibly be dyed? (8)
I believe the answer is:
coloured
'be dyed?' is the definition.
(I've seen this before)
'could roe possibly' is the wordplay.
'possibly' indicates an anagram.
'could'+'roe'='couldroe'
'couldroe' is an anagram of 'COLOURED'.
(Other definitions for coloured that I've seen before include "Tinted" , "Dyed" , "blushed" , "It's not black or white" , "Rich in pigment" .)