Loch —, body of water in Scotland east of Fort William between Loch Treig and Loch Ericht (6)
I believe the answer is:
ossian
(Other definitions for ossian that I've seen before include "Legendary Cthree Gaelic bard" , "Invented Irish hero" , "Fictitious Irish poet" , "Gaelic bard, son of Fingal" , "Legendary Gaelic poet faked by Macpherson" .)