Well, not less than famously (4)

I believe the answer is:

ably

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'well' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for ably that I've seen before include "In capable manner" , "well" , "Masterfully" , "Competently" , "In a competent fashion" .)

I've seen this clue in the Evening Standard.

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