I did obscene dancing with European, displaying bad behaviour (12)
I believe the answer is:
disobedience
'bad behaviour' is the definition.
(eg disobeying rules)
'i did obscene dancing with european' is the wordplay.
'dancing with' indicates anagramming the letters.
'european' becomes 'E' (abbreviation e.g. EU).
'i'+'did'+'obscene'='ididobscene'
'ididobscene' with its letters anagrammed with 'e' gives 'DISOBEDIENCE'.
'displaying' acts as a link.
(Other definitions for disobedience that I've seen before include "Failure to take orders" , "Not following rules" , "Lack of submission" , "Insubordination" , "See 21" .)