Crossword Genius

Top up a vessel (3)

Ross

I believe the answer is:

pot

'a vessel' is the definition.
(type of container)

'top up' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'top' backwards is 'POT'.

(Other definitions for pot that I've seen before include "Cooking vessel, plant container and street drug" , "Kitchen utensil or slang cannabis" , "Ceramic container" , "Ceramic vessel" , "...Karenina(Tolstoy)" .)

I've seen this clue in the Evening Standard.
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