In which the instructor won't wear the wrong gear (7,6)

I believe the answer is:

driving lesson

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'the instructor won't wear the wrong gear' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'in' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'which' is the link.

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I've seen this clue in The Irish Independent.

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