Climb on K2? (5)
I believe the answer is:
mount
'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" .)