High-kicking dance (6)
'high-kicking dance' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cancan that I've seen before include "Parisian stage dance" , "Parisian high-kicking dance" , "Dance of the French music halls" , "from 23a [LA VIE PARISIENNE]?" , "High-kicking dance of a female chorus line" .)
(Another definition for can-can that I've seen is " Cole Porter musical of 1953".)