DJ's part in city rave ultimately secured by playing LPs (6)
I believe the answer is:
lapels
'dj's part' is the definition.
(part of a dinner jacket)
'city rave ultimately secured by playing lps' is the wordplay.
'city' becomes 'LA' (Los Angeles).
'ultimately' says to take the final letters.
'secured by' is an insertion indicator (inserted letters are held or secured).
'playing' is an anagram indicator.
The last letter of 'rave' is 'e'.
'lps' is an anagram of 'pls'.
'e' put within 'pls' is 'pels'.
'la'+'pels'='LAPELS'
'in' acts as a link.
(Other definitions for lapels that I've seen before include "Turnovers at the neck" , "Folded flaps at front of coat" , "Parts of collars" , "Folded-back flaps on front of coat" , "They turn back on the front" .)