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" .)