9 across
Adult
adores
snorting
cocaine
in
corners
(7)
Adult adores snorting cocaine in corners (7)
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The definition is at the end of the clue.
How the clue works
Corners is the definition. Start with A (adult) and LOVES (adores), then have LOVES "snorting" C (cocaine) — i.e. C inserted into LOVES to give LCOVES — all after A, giving ALCOVES.