Clean comb (5)

I believe the answer is:

scour

This clue is a double definition.

'clean' is the first definition.
(thesaurus)

'comb' is the second definition.
(thesaurus)

(Other definitions for scour that I've seen before include "Look high and low" , "Clean by rubbing with an abrasive" , "scrub and scrape" , "purge" , "Clean - scout" .)

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

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