Canine coat (6)
I believe the answer is:
enamel
'canine coat?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enamel that I've seen before include "Shiny coat as on teeth" , "Hard, glossy protective coating" , "hard cover" , "Hard gloss paint" , "Decorative or protective covering on metal or glass." .)