Crossword Genius

Last drink? Cheers! (7,2)

Ross

I believe the answer is:

bottoms up

'cheers' is the definition.
(both can be said before having a drink)

'last drink?' is the wordplay.
'last' becomes 'bottom' (I've seen this before).
'drink?' becomes 'sup' (to sup is to drink).
'bottom'+'sup'='BOTTOMS UP'

(Other definitions for bottoms up that I've seen before include "Toast" , "Cheers!" , "Down the hatch!" , "Your good health!" , "down it goes!" .)

I've seen this clue in The Times.
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