Editor brings in workers to do what he does
I believe the answer is:
emend
'do what he does' is the definition.
The definition suggests a singular noun but the answer is not.
'editor brings in workers' is the wordplay.
'editor' becomes 'ed'.
'brings in' means one lot of letters goes inside another.
'workers' becomes 'men' (men can mean staff or employees).
'ed' enclosing 'men' is 'EMEND'.
'to' is the link.
Can you help me to learn more?
(Other definitions for emend that I've seen before include "Make improvements or corrections" , "get rid of faults" , "Make improvements to (text)" , "make an improvement" , "Improve by editing" .)