Possible Clues:

• Ill muon (anag) – window divider
• Bar between glass panes
• Civil parish on the west side of the Lizard peninsula, with a cove including a fishing harbour
• Vertical bar which separates window panes
• Vertical bar between window panes
• Two thirds of wine that's charged in bar is on display in the window
• Upright member, one getting on after study
• Pair of Hebridean islands lacking a bar
• Greek character left with wild animal -- a feature of window design
• Vertical strip between the panes of a window