For this particular purpose, include white wine, it's said (2,3)

I believe the answer is:

ad hoc

'for this particular purpose' is the definition.
(ad hoc means when necessary)

I cannot understand how the rest of the clue works.

(Other definitions for ad hoc that I've seen before include "Applied to a particular situation" , "not in general practice" , "(Created) for particular purpose" , "(Of committee) formed for a single purpose" , "For a specific purpose - Latin expression" .)

I've seen this clue in The Guardian.

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