Crossword Genius

Also have wine, as discussed, when needed (2,3)

Ross

I believe the answer is:

ad hoc

'when needed' is the definition.
(ad hoc can mean when needed)

I can't explain the remainder of the clue.

(Other definitions for ad hoc that I've seen before include "Applied to a particular situation" , "specific occasion" , "Latin notation - for a specific purpose" , "For one particular purpose" , "For a specific purpose, say an arrangement" .)

I've seen this clue in The Telegraph.
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