One with lots of teeth worries a wife (7)

I believe the answer is:

fretsaw

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'one with lots of teeth' is the definition.
I can't judge whether this defines the answer.

'worries a wife' is the wordplay.
'worries' becomes 'frets' (fretting is a kind of worrying).
'wife' becomes 'w' (abbreviation).
'frets'+'a'+'w'='FRETSAW'

Can you help me to learn more?

(Other definitions for fretsaw that I've seen before include "Woodworking tool" , "cutter" , "Woodcutter" , "Tool for cutting designs in wood" , "Fine-toothed tool" .)

I've seen this clue in The Guardian.

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