In best of health? Agreed (4,4)

I believe the answer is:

very well

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'agreed' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for very well that I've seen before include "Agreed" , "Outstandingly" , "In excellent health - all right" , "Phrase indicating compliance or assent" , "Enjoying great health" .)

I've seen this clue in The Times.

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