Hears your labourer's case and has a crack at it (5,4,4)

I believe the answer is:

tries ones hand

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'case and has a crack at it' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'hears your labourer's' is the wordplay.
'hears' becomes 'tries' (to try or hear in the legal sense).
'your' becomes 'ones' (I've seen this in other clues).
'labourer' becomes 'hand' (hand is a kind of labourer).
'tries'+'ones'+'hand'='TRIES ONES HAND'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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