Second job keeping record (6)
I believe the answer is:
deputy
'second' is the definition.
(thesaurus)
'job keeping record' is the wordplay.
'job' becomes 'duty'.
'keeping' is an insertion indicator (some letters kept inside).
'record' becomes 'EP' (abbreviation for extended play record).
'duty' enclosing 'ep' is 'DEPUTY'.
(Other definitions for deputy that I've seen before include "Person appointed to act as substitute" , "Stand-in, delegate" , "number two" , "Subordinate" , "Second-in-command" .)