Related Clues:
- It's not light, of course
- One does not know the form of such a nightmare
- It's a nightmare not knowing its form
- One does not know the form that 14 down may take
- Not for a favourite and not point-blank
- Quite amount of mystery how it could be in 8 down
- Not point-blank guess
- You know little of such a nightmare
- A mysterious amount of black beauty
- Was Black Beauty a nightmare?
- One might guess it would need a driver
- Surprise candidate
- Outsider sets heart on contraband
- One with unexpected talents, certainly not grey
- Competitor of unknown capabilities