Unearth a very small amount (5)

I believe the answer is:

trace

This clue is a double definition.

'unearth' is the first definition.
(thesaurus)

'a very small amount' is the second definition.
(I've seen this in another clue)

(Other definitions for trace that I've seen before include "Find by investigation" , "Skimpy garment" , "Vestige, hint" , "Follow and find" , "Follow to source" .)

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

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