Crossword Genius

Caught flexible person at the rock wall gym? (7)

Ross

I believe the answer is:

climber

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

'person at the rock wall gym?' is the definition.
I can't tell whether this definition defines the answer.

'caught flexible' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'flexible' becomes 'limber' (similar in meaning).
'c'+'limber'='CLIMBER'

Can you help me to learn more?

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

I've seen this clue in The Times.
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