Related Clues:

• It's sticking out at the side at last
• Sounds as if it hurts to get one in the window
• See through one of 17 across with 15 across initially
• Fifty on the side and that's sticking out
• Climber's rest stop, maybe
• Perch, at times
• Window sill, for one
• French door piece
• Windshield, e.g
• 17-Down part
• See-through piece
• One of several on a French door
• Ridge was in front, for example, when climbing
• Guided, for example, back to the shelf
• Piece of glass in window