Alpine ridge needs some spare tents
I believe the answer is:
arete
'alpine ridge' is the definition.
'arete' can be an answer for 'ridge' (I've seen this before). I'm not certain of the 'alpine' bit.
'some spare tents' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ARETE' can be found hidden inside 'spare tents'.
'needs' is the link.
Can you help me to learn more?
(Other definitions for arete that I've seen before include "Narrow mountain ridge - eater (anag)" , "Sharp ridge on mountain, with a tree" , "part of mountain range" , "feature of range" , "Glacial ridge" .)