28 across
Drink
in
the
past
contributing
to
atmosphere
in
islands
(9)
Drink in the past contributing to atmosphere in islands (9)
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The definition is at the end of the clue.
How the clue works
Right, so islands is your definition here - they're after the Galapagos. For the wordplay, take GAS as your "atmosphere", but don't use it whole - split it into GA and S, and stuff LAP (that's your "drink") and AGO (which does the job of "in the past") in between, giving you GA plus LAP plus AGO plus S strung together.