Crossword Genius

Barely detectable amount (5)

Ross

I believe the answer is:

trace

'barely detectable amount' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for trace that I've seen before include "Vestige, hint" , "Copy by drawing on translucent paper" , "Locate by investigation" , "Follow and find" , "a piece of harness" .)

I've seen this clue in the Newsday, the LA Times and the USA Today.
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