John might dance (6)

I believe the answer is:

cancan

'dance' is the definition.
(cancan is a kind of dance)

'john might' is the wordplay.
'john' becomes 'can' (both can informally mean toilet).
'might' becomes 'can'.
'can'+'can'='CANCAN'

(Other definitions for cancan that I've seen before include "Lively French stage dance" , "Lively French dance, doubly permissive" , "High-kicking French dance, once considered naughty" , "Lively Parisian dance" , "Kicking entertainment" .)

I've seen this clue in The Guardian.

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