Crossword Genius

One is agile on top of Cairngorms? (7)

Ross

I believe the answer is:

climber

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

'top of cairngorms?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'one is agile on' is the wordplay.
'one is' becomes 'c' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'agile' becomes 'limber' (I've seen this before).
'on' says to put letters next to each other.
'c'+'limber'='CLIMBER'

Can you help me to learn more?

(Other definitions for climber that I've seen before include "Bonnington" , "Mountaineer" , "Plant such as ivy" , "in the garden" , "Plant that grows up a support" .)

I've seen this clue in The Telegraph.
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