Caught a glimpse of cutter (3)
I believe the answer is:
saw
This clue is a double definition.
'caught a glimpse of' is the first definition.
(I've seen this in another clue)
'cutter' is the second definition.
(I know that saws cut things)
(Other definitions for saw that I've seen before include "Old saying with teeth" , "Carpentry tool" , "Toothed blade" , "Old saying - cutting kind" , "Picked out" .)