Rotten person's nasty smell down below? (7)

I believe the answer is:

bounder

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'rotten person's nasty' is the definition.
I can't judge whether this defines the answer.

'smell down below?' is the wordplay.
'smell' becomes 'bo' (abbreviation for Body Odour).
'down below?' becomes 'under' ('under' can be a synonym of 'down below').
'bo'+'under'='BOUNDER'

Can you help me to learn more?

(Other definitions for bounder that I've seen before include "The skipper" , "Untrustworthy type (once)" , "A cad - or a kind of jumper" , "despicable man" , "Dishonourable man (dated colloq.)" .)

I've seen this clue in The Independent.

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