Crossword Genius

A trace (4)

Ross

I think it could be either:

mark

dreg

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

This is the entire clue.

(Other definitions for dreg that I've seen before include "Small amount left over" , "Small quantity (of residue?)" , "Trace" .)

I've seen this clue in The Daily Mail.
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