Across
- 2. Gang leader with ancient shiny metal (4)
- 4. Particle has complicated route from north to north (7)
- 5. Intensive Care Unit found in calm, grey metal (7)
- 7. Cup missing peas mistaken for a policeman (6)
- 9. False pride concealed oxygen, in a row (6)
- 10. Shells of sulfate, phosphate, dichromate and fluoride moving around an object ending with foil (7)
- 14. Unknown surrounds one - that's negative (5)
- 15. Positively not an amateur, also not mixed up (6)
- 17. Elect no Captain with group of males containing essential substance (7)
- 18. Removing power from those opposite results in a natural variation (7)
Down
- 1. Confused hints after a new core? (7)
- 3. Highly reactive wedding vow read back within the additive result (6)
- 6. Fitting in High-Low within the central part of a halogen (8)
- 7. Diamond-like particle made of complex sugar not switched off (6)
- 8. False assumption to take nitrogen from fertiliser component (9)
- 11. It's charged when ordering a tonic (6)
- 12. Jeweller's metal known by leaders of surgery inside Las Vegas emergency rooms (6)
- 13. Rho hidden in a green light followed by climbing a vertical column (5)
- 16. Bright light found in Cambrian eons (4)