"Survivor" shelter (3)
I believe the answer is:
hut
'survivor shelter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hut that I've seen before include "Small roughly-made house or shelter" , "Small, simple shelter" , "Simple abode" , "Small crudely-built shelter" , "'Shack, hovel (3)'" .)