4 down
Cooped
up
at
home,
a
luxurious
one
(9)
Cooped up at home, a luxurious one (9)
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The definition is at the end of the clue.
How the clue works
The definition is a luxurious one, a swanky flat at the top of a building. For the wordplay, you've got PENT, which is "cooped up", sitting right beside HOUSE for "home", and together they spell out the answer.