Club course in Techno dancing (9)
I believe the answer is:
truncheon
'club' is the definition.
(type of weapon)
'course in techno dancing' is the wordplay.
'course' becomes 'run' (synonyms).
'in' indicates putting letters inside.
'dancing' indicates anagramming the letters.
'techno' anagrammed gives 'tcheon'.
'run' inserted within 'tcheon' is 'TRUNCHEON'.
(Other definitions for truncheon that I've seen before include "Policeman's traditional weapon" , "Cosh" , "Police baton" , "Police staff" , "Peelers' baton" .)