28 across
Former
garret,
very
large
area,
right?
(5)
Former garret, very large area, right? (5)
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The definition is at the beginning of the clue.
How the clue works
Former garret is your definition — SOLAR being an archaic word for an upper room or loft in a medieval house. Then the wordplay builds it piece by piece: SO meaning very, L for large, A for area, and R for right, all strung together to give you the answer.