Toping drunkenly is a matter of choice (6)

I believe the answer is:

opting

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'a matter of choice' is the definition.
I can't tell whether this defines the answer.

'toping drunkenly' is the wordplay.
'drunkenly' indicates an anagram.
'toping' with letters rearranged gives 'OPTING'.

'is' is the link.

Can you help me to learn more?

(Another definition for opting that I've seen is " 'Choosing, plumping (6)'".)

I've seen this clue in the Evening Standard.

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