Disdained to treat Ed's corn (7)
I believe the answer is:
scorned
'disdained' is the definition.
('scorn' can be a synonym of 'disdain')
'treat ed's corn' is the wordplay.
'treat' is an anagram indicator.
'eds'+'corn'='edscorn'
'edscorn' with letters rearranged gives 'SCORNED'.
'to' is the link.
(Other definitions for scorned that I've seen before include "Dismissed" , "Treated with contempt" , "''Hell hath no fury like a woman .. . . . . .''" , "Derided" .)