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Into
which
to
disappear
up
Everest?
(4,3)
Into which to disappear up Everest? (4,3)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue is a cryptic definition built around the idiom "to vanish into thin air" — and of course, the air up at the top of Everest is quite literally thin. There's no separate wordplay here; the entire clue works as one wry, self-contained definition.