Oberon is left partially rebuffed in a Shakespearean setting (8)
I believe the answer is:
elsinore
'a shakespearean setting' is the definition.
(Hamlet is set in Elsinore in Denmark)
'oberon is left partially rebuffed' is the wordplay.
'partially' says the answer is hidden in the clue.
'rebuffed' shows that the letters should be reversed in order.
'eronisle' can be found hidden inside 'oberon is left'.
'eronisle' in reverse letter order is 'ELSINORE'.
'in' is the link.
(Other definitions for elsinore that I've seen before include "wicked behaviour played out here?" , "Relies on to find Hamlet's castle in Denmark" , "Tragic scene" , "Location for Hamlet" , "Zealand port" .)