Teaching climbers? (8)
I believe the answer is:
training
'teaching' is the definition.
(training is a kind of teaching)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for training that I've seen before include "Aiming" , "Doing exercise" , "Preparing for athletic performance" , "in practice" , "Disciplined preparation" .)