Possible Clues:

• Strathclyde lake
• Loch ___ ('bonnie banks' site, in song)
• Loch on the border of the Highlands
• Scottish loch in song
• Scotland's Loch ___
• Scots loch in song
• It's a loch
• West ___ (highest point in County Fife)
• Scottish loch
• Loch northwest of Glasgow