Crossword Genius

A drink of benefit or interest (4)

Ross

I believe the answer is:

sake

I believe this is a triple definition!

'a drink' is the first definition.
(sake is a kind of drink)

'of' is a link.

'benefit' is the second definition.
(sake is a kind of benefit)

'or' acts as a link.

'interest' is the third definition.
(I know that interest can be written as sake)

(Other definitions for sake that I've seen before include "Japanese alcoholic drink make from rice" , "Benefit - behalf" , "Japanese spirit made from rice" , "Benefit - Japanese liquor" , "'Reason, purpose (4)'" .)

I've seen this clue in the Evening Standard.
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