Water in a cup on demand (4)

I believe the answer is:

pond

'water' is the definition.
(pond is a kind of water)

'in a cup on demand' is the wordplay.
'in' indicates the answer is hidden within the clue.
'POND' is hidden within 'cup on demand'.

(Other definitions for pond that I've seen before include "Small body of water" , "Possible site for weed" , "Himalayan country" , "Pool of still water" , "Small lake" .)

I've seen this clue in the Evening Standard.

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