Related Clues:

• Respond to plea to return to the stage
• Respond (to stimulus)
• Behave in response
• Trace (anag)
• Show emotion, say
• Undergo a chemical change
• Turn another color, say
• Rebel against another performance from actor perhaps
• Fight back, say
• Do a spit take, e.g
• Ooh and aah, e.g
• Do a spit-take, e.g
• It's about part in the play to show response
• Combine chemically
• Undergo a chemical transformation