| Powerful, effective |
FORCEFUL |
| Protect by taking out a policy |
INSURE |
| Raises trivial objections |
CAVILS |
| Round fastener |
BUTTON |
| Scottish estuaries |
FIRTHS |
| Seized and took into custody |
ARRESTED |
| Short of money |
HARDUP |
| South American state |
PERU |
| Stared angrily |
GLOWERED |
| Stays on the surface of liquid |
FLOATS |
| The Great Barrier ..., Australian natural wonder |
REEF |
| They work below ground |
MINERS |
| Three-hulled boat |
TRIMARAN |
| Triangular bracket of brick or stone |
CORBEL |
| Wheel-shaft |
AXLE |
| Workers' organisations |
UNIONS |