Rush to enter fancy techno club (9)
I believe the answer is:
truncheon
'club' is the definition.
(truncheon is a kind of club)
'rush to enter fancy techno' is the wordplay.
'rush' becomes 'run'.
'to enter' means one lot of letters goes inside another.
'fancy' is an anagram indicator.
'techno' with letters rearranged gives 'tcheon'.
'run' placed inside 'tcheon' is 'TRUNCHEON'.
(Other definitions for truncheon that I've seen before include "Policeman's traditional weapon" , "Police baton" , "Police staff" , "Police weapon" , "Peelers' baton" .)