It's shown by one looking for scraps (12)

I believe the answer is:

belligerence

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'scraps' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand the rest of the clue.

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(Other definitions for belligerence that I've seen before include "Aggression" , "Aggressiveness" , "Pugnacity" , "Aggressive behaviour" , "sabre-rattling" .)

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

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