Related Clues:

• Act unprofessionally
• Mug, e.g.
• Get all histrionic
• Play act
• Be hammy
• Play to the back of the audience
• Steal the scene, say
• Act amateurishly
• Show one's feelings
• Engage in cabotinage
• Try to steal the scene, maybe
• Go too far onstage
• Play broadly
• Act the clown
• Turn on the waterworks, maybe