Knock back drink after drink; result - uproar (6)

I believe the answer is:

rumpus

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'uproar' is the definition.
(I've seen this before)

'knock back drink after drink' is the wordplay.
'knock back' is a reversal indicator.
'drink' becomes 'sup' (to sup is to drink).
'after drink' becomes 'mur' (I can't justify this - if you can you should give a lot more credence to this answer).
'sup'+'mur'='supmur'
'supmur' written backwards gives 'RUMPUS'.

'result' acts as a link.

Can you help me to learn more?

(Other definitions for rumpus that I've seen before include "Kerfuffle" , "Tumult" , "To-do" , "Making a fuss" , "Harsh rough nature" .)

I've seen this clue in The Globe and Mail.

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