17 across
With
windows
sealed,
say,
in
hut
(9)
With windows sealed, say, in hut (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is With windows sealed, which describes something shuttered. Take UTTER for "say" and slot it inside SHED, meaning "hut", splitting the hut as SH and ED to wrap around UTTER and give the answer.