Legislator recording participating in required work (6)
I believe the answer is:
deputy
'legislator' is the definition.
(I know that deputy is a type of legislator)
'recording participating in required work' is the wordplay.
'recording' becomes 'EP' (extended play vinyl record).
'participating in' means one lot of letters goes inside another.
'required work' becomes 'duty' (what you're required to do).
'ep' inserted inside 'duty' is 'DEPUTY'.
(Other definitions for deputy that I've seen before include "Person standing in" , "Assistant with power to act when alone" , "Not the principal" , "One who stands in" , "One given the power to act for another" .)