Crossword Genius

Assay stamp (8)

Ross

I believe the answer is:

hallmark

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

This is the entire clue.

(Other definitions for hallmark that I've seen before include "Distinctive feature" , "Stamp indicating standard of gold etc" , "Metal assay sign" , "Assay-stamp" , "Sign of authenticity (eg of silver)" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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