Crossword Genius

What one made sure was sharp? (3)

Ross

I believe the answer is:

saw

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

'sharp?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'what one made sure was' is the wordplay.
'was' can be anagrammed to 'SAW'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for saw that I've seen before include "Observed the old saying?" , "Cutting tool - did 23" , "Viewed; adage" , "Was turned into a cutting tool" , "Implement for cutting wood" .)

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