Caught sight of cutting tool (3)
I believe the answer is:
saw
I believe this is a double definition.
'caught sight of' is the first definition.
(I've seen this before)
'cutting tool' is the second definition.
(I've seen this before)
(Other definitions for saw that I've seen before include "Perceived visually" , "Wise old saying about a tool" , "Realised" , "Old saying for wood cutter" , "Implement for cutting wood" .)