Crossword Genius

Said to use wine in cooking for a particular purpose (2,3)

Ross

I believe the answer is:

ad hoc

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'a particular purpose' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for ad hoc that I've seen before include "(Of committee) formed for a single purpose" , "For a specific purpose - latin phrase" , "'Improvised or impromptu (2,3)'" , "Latin notation - for a specific purpose" , "not in general practice" .)

I've seen this clue in the Sydney Morning Herald.
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