1: Do the young work for long? (5)

4: Three kernels of copper-yellow grain (3)

7: Gather and count to the next-highest multiple (5,2)

8: Heard Italian city in canyon is from the stone age, perhaps (3-6)

10: Magician's handy craft of little importance for the auditor (7)

12: Raw material for Swedish coins (3)

13: Goods carried from the capital of Crete to Jason's ship (5)

2: 4-down Arias hit high note in some of the lungs (3,3)

3: Ale curing outbreak of nervous pain (9)

4: Hazardous emanation from river used by a crime boss (5)

5: You're told the cost in old money (7)

6: Artist portrays Manx sow, carefree cassowary? (7)

9: Robe's eyelet exposes more than fat (5)

11: Startled, grabs sailor (3)