Monarch visiting Skye, perhaps, back in castle (8)
I believe the answer is:
elsinore
'castle' is the definition.
(I've seen this before)
'monarch visiting skye perhaps back' is the wordplay.
I cannot really see how this works, but
'monarch' could be 'r' (r is abbreviation for rex) and 'r' is present in the answer.
'visiting' could be 'in' and 'in' is located in the answer.
This explanation may well be incorrect...
'in' is the link.
(Other definitions for elsinore that I've seen before include "Scene of Hamlet" , "Castle in Hamlet" , "Danish city" , "Tragic scene" , "place in Hamlet" .)