Mountaineer (7)

I believe the answer is:
climber
'mountaineer' is the definition.
(I know that climber is a type of mountaineer)
This is the entire clue.
(Other definitions for climber that I've seen before include "Plant that grows up a support" , "Bonnington" , "Edward Whymper, for example" , "Mountaineer" , "in the garden" .)