People employed by editor to edit (5)
I believe the answer is:
emend
'edit' is the definition.
(thesaurus)
'people employed by editor' is the wordplay.
'people' becomes 'men' (man is a kind of person).
'employed by' indicates putting letters inside.
'editor' becomes 'ed'.
'men' inserted within 'ed' is 'EMEND'.
'to' acts as a link.
(Other definitions for emend that I've seen before include "get rid of faults" , "Improve (texts)" , "change" , "Rectify" , "Make correction in written material" .)