Crossword Genius

Fingerprint expert? (3)

Ross

I think it could be either:

This clue is a double definition.

'fingerprint' is the first definition.
(I've seen this before)

'expert' is the second definition.
(thesaurus)

(Other definitions for dab that I've seen before include "Small North Atlantic flatfish" , "Apply small amounts (usually a liquid) to a surface" , "Bad kind of fish" , "[SOMETHING FISHY]" , "A fish; light touch" .)

I've seen this clue in The Guardian and The Telegraph.
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