Noticed a hand tool (3)
I believe the answer is:
saw
This clue is a double definition.
'noticed' is the first definition.
(I've seen this in another clue)
'a hand tool' is the second definition.
(I know that saw is a type of hand tool)
(Other definitions for saw that I've seen before include "Witnessed" , "Observed the old saying?" , "Toothed cutting tool" , "Viewed; adage" , "Old saying for wood cutter" .)