English men seen with duke? Correct! (5)
I believe the answer is:
emend
'correct' is the definition.
(to emend something is to correct or improve it)
'english men seen with duke?' is the wordplay.
'english' becomes 'E' (abbreviation).
'seen with' says to put letters next to each other.
'duke?' becomes 'd' (abbreviation).
'e'+'men'+'d'='EMEND'
(Other definitions for emend that I've seen before include "Remove errors" , "Polish" , "Make correction in written material" , "Make changes to (a text)" , "Improve by editing" .)