Comb or saw part (5)
I believe the answer is:
tooth
I believe this clue is a double definition.
'comb' is the first definition.
(thesaurus)
'saw part' is the second definition.
('tooth' is part of 'saw')
(Other definitions for tooth that I've seen before include "Incisor, e.g." , "Jag on the edge of a saw" , "Eg, molar" , "Let it stand" , "Gearwheel cog" .)