See a fellow is covered (4)
I believe the answer is:
clad
'is covered' is the definition.
(I've seen this before)
'see a fellow' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'a fellow' becomes 'lad' ('lad' can be a synonym of 'fellow').
'c'+'lad'='CLAD'
(Other definitions for clad that I've seen before include "Provided with covering" , "Invested" , "Clothed, covered" , "in dress perhaps" , "Dressed" .)