Crossword Genius

Noticed a blade (3)

Ross

I believe the answer is:

saw

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'noticed' is the first definition.
(I've seen this in another clue)

'a blade' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

Can you help me to learn more?

(Other definitions for saw that I've seen before include "Witnessed" , "Perceived visually" , "Old saying - cutting kind" , "Spotted" , "Grasped" .)

I've seen this clue in The Mirror.
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