Some severe storm would impede climbing it (7)
I believe the answer is:
everest
'impede climbing it' is the definition.
I can't tell whether this definition defines the answer.
'some severe storm would' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EVEREST' is hidden in the letters of 'severe storm would'.
(Other definitions for everest that I've seen before include "High mountain" , "Himalyan peak" , "Huge achievement - highest climb" , "Himalayan mount" , "One conquered in 1953" .)