Crossword Genius

I’m going uphill, mostly in contest with climbing little vehicle (7)

Ross

I believe the answer is:

minicar

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

'i'm going uphill mostly in contest with climbing' is the definition.
I know nothing about this answer so I can't judge whether this works.

'little vehicle' is the wordplay.
'little' becomes 'mini'.
'vehicle' becomes 'car' (car is a kind of vehicle).
'mini'+'car'='MINICAR'

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