Coat found on canine? (6)

I believe the answer is:

enamel

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'coat' is the definition.
(I know that enamel is a type of paint)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for enamel that I've seen before include "Hard type of paint" , "Glassy substance" , "Tooth surface" , "Coating for a tooth" , "Hard, glossy protective coating" .)

I've seen this clue in The Sun.

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