Crossword Genius

With this, pound feeds a brave soul when toiling? (5,6)

Ross

I believe the answer is:

slave labour

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

'with' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'pound feeds a brave soul when toiling?' is the wordplay.
I cannot really see how this works, but
'pound' could be 'l' (the pound sign is based on an L) and 'l' is found within the answer.
'a' is within the answer.
'soul' could be 'abo' (Abo is an example) and 'abo' is present in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
This explanation may well be incorrect...

'this' is the link.

Can you help me to learn more?

(Other definitions for slave labour that I've seen before include "Hard work for inadequate reward" , "Coerced work for no money" .)

I've seen this clue in The Guardian.
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