Racket from nightclub rankled outsiders (7)
I believe the answer is:
discord
'racket' is the definition.
(thesaurus)
'nightclub rankled outsiders' is the wordplay.
'nightclub' becomes 'disco' (a disco is a club for dancing).
'outsiders' means to remove the middle letters (only the letters on the outside of the word remain).
'rankled' with its centre taken out is 'rd'.
'disco'+'rd'='DISCORD'
'from' acts as a link.
(Other definitions for discord that I've seen before include "cacophony" , "Disagreement" , "Strife, lack of harmony" , "contention" , "Friction" .)