Cup ('full of the warm South' in Keats's Ode to a Nightingale) (6)

I believe the answer is:

beaker

(Other definitions for beaker that I've seen before include "Small open glass with straight sides and a lip" , "Glass container in a laboratory" , "Cup with a wide mouth" , "Drink container" , "Mug - large glass" .)

I've seen this clue in The Guardian.

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