It has teeth but no mouth (3)
I believe the answer is:
saw
'it has teeth but no mouth' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for saw that I've seen before include "Old saying for woodcutter" , "Perceived visually" , "See 23" , "Carpentry tool" , "Toothed blade" .)