Crossword Genius

Commotion, having drink knocked back after drink (6)

Ross

I believe the answer is:

rumpus

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

'commotion' is the definition.
(I know that commotion can be written as rumpus)

'drink knocked back after drink' is the wordplay.
'drink' becomes 'rum' (rum is a kind of drink).
'knocked back' says the letters should be written backwards.
'after drink' becomes 'sup' (to sup is to drink. I am not sure about the 'after' bit.).
'sup' backwards is 'pus'.
'rum'+'pus'='RUMPUS'

'having' is the link.

Can you help me to learn more?

(Other definitions for rumpus that I've seen before include "5a [BALLYHOO] involving noise" , "Harsh rough nature" , "Uproar or angry dispute" , "Tumult" , "'Commotion, din (6)'" .)

I've seen this clue in The Telegraph.
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