Canine attached to sheep (6)
I believe the answer is:
mutton
'to sheep' is the definition.
(I've seen this before)
'canine attached' is the wordplay.
'canine' becomes 'mutt' (mutt is a kind of dog).
'attached' becomes 'on' (I've seen this in other clues).
'mutt'+'on'='MUTTON'
(Other definitions for mutton that I've seen before include "Meat sometimes dressed as lamb" , "Meat that may dress as lamb" , "Flesh of sheep" , "Dead, we are told" , "Meat that may be dressed as lamb" .)