Small crude shelter (3)
I believe the answer is:
hut
'small crude shelter' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hut that I've seen before include "Peter Nissen's ubiquitous structure" , "'Shack, hovel (3)'" , "Shanty" , "Simple dwelling" , "Small building or shelter" .)