Small cabin, closed (4)
I believe the answer is:
shut
'closed' is the definition.
(I know that closed can be written as shut)
'small cabin' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cabin' becomes 'hut' (both can mean a small building).
's'+'hut'='SHUT'
(Other definitions for shut that I've seen before include "Closed" , "not accepting visitors" , "Out of business" , "See 19" , "Draw to" .)