Sheds inexplicably shut (4)

I believe the answer is:

huts

I'm a little stuck... Click here to teach me more about this clue!

'sheds' is the definition.
(I've seen this before)

'inexplicably shut' is the wordplay.
'shut' anagrams to 'HUTS'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for huts that I've seen before include "Wooden shelters" , "Sheds" , "Cabins" , "Temporary dwellings" , "Shacks" .)

I've seen this clue in The Mirror.

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