Desert sanctuary (5)
I believe the answer is:
oasis
'desert sanctuary' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oasis that I've seen before include "Place of rest in the midst of gloom" , "Fertile patch in a desert" , "Desert sanctuary" , "haven for travellers" , "Fertile place in a desert, watering-hole" .)