Related Clues:

• Be careful!
• Telephone wire, for a bird
• Birdcage bar
• Where a canary sings
• What a bird might do to get fish
• Matter of degree?
• Minor mutation in angelfish
• Right, acute or obtuse
• The space where two lines intersect
• Fish — roost
• Bony food fish
• Tricky thing to trisect, in classical geometry
• Person keeping watch
• Billiards shot concern
• Keeps sketch locally in watchtower