Refined journo ignored ad-lib (6)

I believe the answer is:

improv

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'ad-lib' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for improv that I've seen before include "little ad-libbing" , "Off-the-cuff comedy" , "off-the-cuff humour" , "Stand-up comedy, perhaps" .)

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

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