Junior's responsibility to input record (6)
I believe the answer is:
deputy
'junior's' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'responsibility to input record' is the wordplay.
'responsibility' becomes 'duty' (synonyms).
'to input' means one lot of letters goes inside another.
'record' becomes 'EP' (abbreviation for extended play record).
'duty' enclosing 'ep' is 'DEPUTY'.
Can you help me to learn more?
(Other definitions for deputy that I've seen before include "Substitute eg for sheriff" , "Person appointed to substitute for another" , "Not the principal" , "number two" , "Person appointed to act as substitute" .)