Crossword Genius

Fossil resin (5)

Ross

I think it could be either:

copal

amber

'fossil resin' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for copal that I've seen before include "Hard resin" , "Resin used in varnish" , "Aromatic tree resin" .)

I've seen this clue in the Evening Standard, The Times, The Mirror, the King Feature Syndicate, the Penny Press and the Sydney Morning Herald.
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