One-off, as a committee (2,3)

I believe the answer is:

ad hoc

(Other definitions for ad hoc that I've seen before include "Done for a particular purpose only" , "For a specific purpose, say an arrangement" , "specific occasion" , "(Of committee) formed for a single purpose" , "For this special purpose (Latin)" .)

I've seen this clue in the King Feature Syndicate.

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