Mum could knit one, or a lorry driver could do it (8)

I believe the answer is:

pullover

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the remainder of the clue.

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(Other definitions for pullover that I've seen before include "top gear?" , "Go to side of road" , "Sweater or jumper" , "Woolly" , "Knitted garment" .)

I've seen this clue in the Evening Standard.

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