Crossword Genius

Who knocked the man down? (5,6)

Ross

I believe the answer is:

slave trader

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

'down?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'who knocked the man' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'man' could be 'rad' and 'rad' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for slave trader that I've seen before include "Dealer in humans" , "Human trafficker" .)

I've seen this clue in the Evening Standard.
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