Western Isles (8)
I believe the answer is:
hebrides
'western isles' is the definition.
(I know that western isles can be written as Hebrides)
This is all the clue.
(Other definitions for hebrides that I've seen before include "Scottish islands" , "Isles?" , "Islands off north-west Scotland" , "Island group off NW Scotland" , "overture" .)