Does all the dirty work for boxer's soul mate

I believe the answer is:

dogsbody

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'does all the dirty work' is the definition.
I can't tell whether this defines the answer.

'boxer's soul mate' is the wordplay.
'boxer's' becomes 'dogs' (I've seen this in other clues).
'soul mate' becomes 'body' (I can't justify this - if you can you should give a lot more credence to this answer).
'dogs'+'body'='DOGSBODY'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for dogsbody that I've seen before include "One who has to do all the boring jobs" , "Go by odds to find menial worker" , "Drudge" , "found in pets' cemetery?" , "One given menial tasks" .)

I've seen this clue in the Irish Times.

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