3 down
Measure
of
alcohol
in
two
alcoholic
drinks
(6)
Measure of alcohol in two alcoholic drinks (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so Measure of alcohol is your definition there — a noggin's a small tot of liquor. For the wordplay, they've bunged together two boozy drinks: NOG, as in eggnog, followed by GIN, and that gives you the answer.