Scorned side sped off (8)
I believe the answer is:
despised
'scorned' is the definition.
(synonyms)
'side sped off' is the wordplay.
'off' is an anagram indicator.
'side'+'sped'='sidesped'
'sidesped' with letters rearranged gives 'DESPISED'.
(Other definitions for despised that I've seen before include "Had contempt or scorn for" , "Felt contempt for" , "Looked down on" , "Scorned" , "Detested" .)