Assistant's job to get hold of record (6)
I believe the answer is:
deputy
'assistant's' is the definition.
(deputy is a kind of assistant)
'job to get hold of record' is the wordplay.
'job' becomes 'duty'.
'to get hold of' indicates putting letters inside.
'record' becomes 'ep'.
'duty' enclosing 'ep' is 'DEPUTY'.
(Other definitions for deputy that I've seen before include "Stand-in official" , "One who stands in" , "One given the power to act for another" , "Subordinate" , "One performing duties when superior is absent" .)