Crossword Genius

A bounder's garment? (6)

Ross

I believe the answer is:

jumper

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

'garment?' is the definition.
(I know that jumper is a type of garment)

'a bounder's' is the wordplay.
I cannot quite see how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is located in the answer.
The remaining letters 'jum' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for jumper that I've seen before include "Top" , "Woollen garment" , "Knitwear - bounder" , "Woolly" , "Kangaroo and knitted garment" .)

I've seen this clue in the Evening Standard.
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