Having found a way through the mountains, I carry on with enthusiasm (7)

I believe the answer is:

passion

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

'enthusiasm' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for passion that I've seen before include "Ardour, fervour" , "Intense enthusiasm for something" , "fire" , "Great emotion" , "Ardent love" .)

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

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