These puzzles are the smallest crosswords around. But they’re also tough, which is why this series is called

Across 1. Break with white foam,as wavetop (4)

5. Declare, bid (cards) (3) 6. Get by labour (3) 7. Keenness; trenchancy (4) Down 2. Poet who lived 43BC-AD17 (4)

3. Chinese dynasty 1368-1643 (4)

4. Have the state or quality mentioned (2)

6. I and others (2) Across 1. Fail to use, perform (4) 4. In accordance with (2) 5. Roman unit of weight (2) 6. Thin wood strip (4) Down 1. Greek weight (4) 2. Expression of surprise (2) 3. Horse’s canine tooth (4) 5. Symbol for astatine (2) Across 1. Railway carriage (3) 4. Jewish prophet of 8th century BC (4)

6. A light aircraft (4) 7. Winged fruit of ash or maple (3) Down 1. ‘The Backs’ river (3) 2. In a frenzy (4) 3. Mechanical memory (4) 5. An attempt, shot (3