24 down
Drink
in
the
bar
periodically
(3)
Drink in the bar periodically (3)
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The definition is at the beginning of the clue.
How the clue works
See Drink sitting there as the definition, pointing us to that beverage. Then "periodically" tells you to pluck alternate letters from "the bar" — t, e, a — and there's your answer spelled straight out.