Cryptic crossword, Issue 21

Across clues

• 1. Ordinary counting number. (7)
• 4. Basic statements about first accepted unknown charged atoms gaining mass by losing neutron. (6)
• 7. Divine blood from one refrain swallowing oxygen. (8)
• 8. A flat topped cone? Made from iron last. (3)
• 9. Illinois elevated railways made from initially electric locomotive siding. (3)
• 11. I’m after initially tough review clip. (4)
• 14. A candle on fire. (6)
• 15. Mark spring cleaning instrument without initial extension rod head for magazine. (9)
• 16. Valley seen in shaping lens. (4)
• 17. Endless untruths, Sophus? (3)
• 19. Centres of attention? An ellipse has two. (4)
• 20. Ode moving brood. (4)
• 21. Units of area measurement augmented reality. (2)
• 22. Endless frost forms an edge. (3)
• 24. Outpouring from heads of joint European team. (3)
• 25. Papers I initially devoured. (2)
• 26. Quite easily demonstrated leads the way for ending proofs. (3)
• 28. Continuous or discrete? Transformation leaves an object unchanged! (9)
• 30. Eco-friendly son of a baker. (5)

Down clues

• 1. Type of analysis studies refashioned minute unclear line. (9)
• 2. Spin tornado without hesitation. (5)
• 3. Egyptian sun god starts to really admire Helios. (3)
• 5. On the back page, put tea in them after contest. (4,3,4)
• 6. Kingly community is oldest scientific academy. (5,7)
• 10. A sailor’s drink without Romeo? Shocking! (4)
• 12. Sacrilege hiding upset. (4)
• 13. This topologist’s an Irish son of a … cartoon beer? (6)
• 18. I say, it is in the same source. (4)
• 20. First-rate notation for a derivative. (5)
• 22. Field perhaps? found in superstring. (4)
• 23. Vhat, Vhere, …? Sounds like our favourite diagram creator. (4)
• 27. Sounds like I contained in Disneyesque facial feature. (3)
• 29. My uncle initially sounds like a cow. (2)