Related Clues:

• Secretion organ
• Donor's offering
• Mass instrument, often
• Source of ballpark pitches?
• Liver or kidney
• Heart or kidney
• It's often played on Sunday
• It's in the ballpark
• Secreting organ
• Church musicmaker
• Adrenal, for instance
• Piped instrument
• Spleen, e.g.
• Club newsletter
• Broadway Phantom's instrument