He works in the stock market (6,6)

I believe the answer is:

cattle dealer

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'he works' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'the stock market' is the wordplay.
'the stock' becomes 'cattle' (I've seen this in another clue).
'market' becomes 'dealer' (I can't explain this - if you can you should give a lot more credence to this answer).
'cattle'+'dealer'='CATTLE DEALER'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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