King in complete turnaround finally went on (6)

I believe the answer is:

droned

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'went on' is the definition.
'droned' can be an answer for 'went' (droning is a kind of going). I'm not certain of the 'on' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for droned that I've seen is " Buzzed".)

I've seen this clue in The Sunday Times and The Times.

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