Related Clues:

• Things that provoke reactions
• Gives a cue
• Actions that produce responses
• What will encourage change for litmus? Iodine
• Spanish agreement to adopt multi-variable incentives
• Small man, university student, one for Spurs?
• Nudges, say
• Son on time to start with nudges actor?
• Does some jogging?
• Things provoking activity
• Words to cue an actor
• Causes of physiological responses
• United, within limits, thrashing Spurs
• Must I lie around without energy? Drugs could be the answer
• Response producers