Mountaineer's need
I believe the answer is:
rope
'mountaineer's need' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rope that I've seen before include "String of pearls, say" , "making money easily when old?" , "Enough to hang one?" , "Master of Suspense directed it" , "Pore over a woven cord" .)