Shack, hovel (3)
I believe the answer is:
hut
I believe this is a double definition.
'shack' is the first definition.
(I know that shack can be written as hut)
'hovel' is the second definition.
(synonyms)
(Other definitions for hut that I've seen before include "Peter Nissen's ubiquitous structure" , "Small shed for storing, say, garden tools" , "'Shack, hovel (3)'" , "Small shelter as for watchman" , "Small, simple shelter" .)