Crossword Genius

Climb on K2? (5)

Ross

I believe the answer is:

mount

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

'climb on' is the definition.
(I know that climb on can be written as mount)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mount that I've seen before include "Take < a back" , "Horse; climb" , "Fix onto a backing" , "Clamber on" , "Increase" .)

I've seen this clue in The Sun.
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