Some of the Orangemen deceived by change (5)
I believe the answer is:
emend
'change' is the definition.
(I've seen this before)
'some of the orangemen deceived by' is the wordplay.
'some of' indicates a hidden word.
'EMEND' is hidden in the letters of 'orangemen deceived by'.
(Other definitions for emend that I've seen before include "Make improvements to (text)" , "Alter something written to correct errors" , "get rid of faults" , "change" , "make an improvement" .)