Sheepdog that is found on Scottish island (6)
I believe the answer is:
collie
'sheepdog' is the definition.
(collie is a kind of sheepdog)
'that is found on scottish island' is the wordplay.
'that is' becomes 'ie' (synonyms).
'found on' says to put letters next to each other.
'scottish island' becomes 'coll' (I've seen this before).
'ie' put after 'coll' is 'COLLIE'.
(Other definitions for collie that I've seen before include "Breed of dog" , "Border dog" , "Sheep-herding dog" , "Long-haired intelligent dog" , "Shepherd's dog" .)