Prevent one leaving less riotous feaster (9)

I believe the answer is:

banqueter

I'm a little stuck... Click here to teach me more about this clue!

'less riotous feaster' is the definition.
The definition suggests a singular noun which matches the answer.

'prevent one' is the wordplay.
I cannot really see how this works, but
'prevent' could be 'ban' (a ban is an attempt to prevent something) and 'ban' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'leaving' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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