Possible Clues:

• Muse of comedy
• Sister of Clio
• Muse of comedy and pastoral poetry
• Comedian's Muse
• Aha, lit up one of the three Graces of Greek mythology
• Name shared by a Grace and a Muse
• In Greek mythology, the Muse of comedy
• Comedy Muse
• Muse of pastoral poetry
• Greek Muse of comedy