Related Clues:
- Vigorous work on sutures
- Hard nut so sure to be in trouble
- Requiring great exertion
- Using much time and effort
- Testing the powers of endurance
- Gruelling
- Not sure flabby American is energetic
- Small and weak admitting run's gruelling
- Requiring considerable time and effort
- Tough promises by Miliband's lot, or ...
- Really fucking hard
- Requiring much time and effort
- Tough sailor about to be shelled in a storm
- Difficult and unusual burials, with nothing going in twice
- Tiring