To do so is work, or sounds so (3)

I believe the answer is:

sew

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'to do so is work' is the definition.
I can't tell whether this definition defines the answer.

'sounds so' is the wordplay.
'sounds' indicates a 'sounds like' (homophone) clue.
'so' is a homophone of 'SEW'.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for sew that I've seen before include "Fasten with needle and thread" , "Stitch with needle and thread" , "Do some needlework" , "Tack" , "Fasten with stitches" .)

I've seen this clue in the Evening Standard.

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