Find, when you make a copy of (5)

I believe the answer is:

trace

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'find' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for trace that I've seen before include "Outline" , "indicator" , "suspicion" , "Smidgen" , "Side strap connecting a horse to what it's pulling" .)

I've seen this clue in the Evening Standard.

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