Not all honourable men do right (5)
I believe the answer is:
emend
'right' is the definition.
(thesaurus)
'not all honourable men do' is the wordplay.
'not all' indicates a hidden word.
'EMEND' can be found hidden inside 'honourable men do'.
(Other definitions for emend that I've seen before include "Remove errors" , "Correct; edit" , "Correct, revise (text)" , "would appear better" , "Edit; make alterations to a draft" .)