A disturbance behind us (6)

I believe the answer is:

rumpus

'a disturbance' is the definition.
(rumpus is a kind of disturbance)

'behind us' is the wordplay.
'behind' becomes 'rump' (informal term for the buttocks).
'rump'+'us'='RUMPUS'

(Other definitions for rumpus that I've seen before include "'Commotion, din (6)'" , "Uproar or angry dispute" , "Hullabaloo" , "Noisy, disruptive commotion" , "Tumult" .)

I've seen this clue in The Sunday Times.

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