Love god in Winchester ostracised (4)
I believe the answer is:
eros
'love god' is the definition.
(Greek god of love)
'in winchester ostracised' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EROS' is hidden in the letters of 'winchester ostracised'.
(Other definitions for eros that I've seen before include "Arrow shooter" , "Greek god of love - see statue in Piccadilly" , "Form of love" , "Greek god of sexual love, Cupid to the Romans" , "London landmark" .)