Tool spied (3)
I believe the answer is:
saw
I believe this is a double definition.
'tool' is the first definition.
(I know that saw is a type of power tool)
'spied' is the second definition.
(I've seen this in another clue)
(Other definitions for saw that I've seen before include "Old saying for woodcutter" , "Spotted" , "Viewed; maxim" , "Carpentry tool" , "item in tool kit" .)