Off up a mountain, for example? (4)
I believe the answer is:
high
This clue could be a double definition.
'off' is the first definition.
(I've seen this before)
'up a mountain for example?' is the second definition.
'high' can be an answer for 'up' (thesaurus). I'm unsure of the 'a mountain for example?' bit.
Can you help me to learn more?
(Other definitions for high that I've seen before include "Hypertension" , "Euphoric; going off" , "At altitude" , "In slang, under the influence of drugs" , "Way up" .)