Crossword Genius

He trains climbers (4,6)

Ross

I believe the answer is:

vine grower

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

'trains climbers' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'he' is the wordplay.
I cannot really understand how this works, but
'he' could be 'vin' and 'vin' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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