Related Clues:

• Voluntary player
• Ballpark feature
• Motion detector, e.g.
• Church keys?
• Polygraph component
• Hurdy-gurdy, e.g.
• Club publication
• Musical instrument
• It plays in church
• It's played on Sunday
• Church keyboard
• Human skin, for one
• Gauge of heat or light, e.g.
• Bach's instrument
• Electric eye, for one