Related Clues:
- Cause of a response
- Means of prompting action
- Reviver
- Nudge — it's about a Greek letter — first letter to the Guardian
- Latin must change? And, this presumably will encourage you to learn it faster!
- Fillip
- Drug viewpoint taking in chap going to University
- Most likely an illegal influence
- Happening to produce regular time
- Often an illegal influence on the track
- Promoting activity
- I must, when drunk, cut down randiness - here's an incentive
- Incitement to activity
- Energizer
- Something provoking a reaction