Crossword Genius

It’s handy when cutting curves (6)

Ross

I believe the answer is:

padsaw

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

'it's handy when cutting curves' is the definition.
I can't judge whether this defines the answer.

'it's' is the wordplay.
I cannot really see how this works, but
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is located in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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