Crossword Genius

Prompt access to summit, often (4)


I believe the answer is:


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

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

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

Can you help me to learn more?

(Other definitions for spur that I've seen before include "Lateral root" , "This provokes sudden movement!" , "Impetus" , "Inducement" , "Cowboy boot attachment" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app