Cogs; fangs (5)
I believe the answer is:
teeth
This clue is a double definition.
'cogs' is the first definition.
(I've seen this before)
'fangs' is the second definition.
(I've seen this in another clue)
(Other definitions for teeth that I've seen before include "Canines, maybe" , "Structures in the jaws" , "Cog wheel projections" , "Fangs" , "Projections on a gear" .)