OK, it is written with panache (4,4)

I believe the answer is:

very well

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'ok' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for very well that I've seen before include "Fit as a fiddle" , "If you insist" , "Expression of (reluctant?) agreement" , "In excellent health - all right" , "If you say so - in extremely good health" .)

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

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