See a boy's covered (4)
I believe the answer is:
clad
'covered' is the definition.
('clothe' can be a synonym of 'cover')
'see a boy's' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'a boy' becomes 'lad' (informal term for boy).
'c'+'lad'='CLAD'
(Other definitions for clad that I've seen before include "in dress perhaps" , "Decked" , "Attired" , "Cover with insulation" , "Dressed" .)