Unexpectedly shut sheds (4)
I believe the answer is:
huts
'sheds' is the definition.
(I've seen this in another clue)
'unexpectedly shut' is the wordplay.
'unexpectedly' is an anagram indicator.
'shut' is an anagram of 'HUTS'.
(Other definitions for huts that I've seen before include "Small crude shelters" , "Wooden shelters" , "Sheds" , "Cabins" , "Temporary dwellings" .)