Belief in proof of guilt (10)

I believe the answer is:

conviction

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'belief' is the definition.
(I know that conviction is a type of belief)

I can't explain the remainder of the clue.

(Other definitions for conviction that I've seen before include "Firm belief" , "it follows proof of guilt" , "Strong belief" , "view" , "Certainty" .)

I've seen this clue in The Globe and Mail.

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