Roll about one and make merry (7)

I believe the answer is:

roister

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'make merry' is the definition.
(roistering is a kind of making merry)

'roll about one and' is the wordplay.
'roll' becomes 'roster' (roll can mean a list or roster).
'about' is an insertion indicator.
'one and' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'roster' placed around 'i' is 'ROISTER'.

Can you help me to learn more?

(Other definitions for roister that I've seen before include "Engage in party activity" , "Carouse" , "Be boisterous" , "Have noisy fun" , "riot" .)

I've seen this clue in The Times.

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