Discover a tiny amount (5)

I believe the answer is:

trace

I believe this clue is a double definition.

'discover' is the first definition.
(I know this)

'a tiny amount' is the second definition.
(I've seen this before)

(Other definitions for trace that I've seen before include "Barely detectable amount" , "Element" , "Cater (anag.)" , "Copy by drawing on translucent paper" , "Smidgen" .)

I've seen this clue in The Daily Express.

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