Quick crossword No 430

Across

1. Old-school writer arrives, we hear (8)
2. Tool confused Azed (4)
3. City in slumber, gazing back (6)
4. Nice ragu concoction is a work of art (8)
5. US state partially over Montana (7)
6. Invalidly taking odd letters out — it's riveting (4)
7. 11-year-old's cutesy note (5)
8. Something that amplifies logic, while dropping answer off a cliff (9)
9. A small amount ruin writing rules (7)
10. Complained a second with an editor (6)
11. Platonic nounal anagram — getting it? (9)
12. Deliberately failed in uncouth rewrite (5)

Down

1. Fighting over crosswords, leaving empty space on the screen (12)
2. Construction is undermined by this unfunny rubbish (3,3)
3. Makes mistakes gutless editor revises (4)
4. Flawed anagram gets edited initially for acting supervisor (5,7)
5. Restored nude sculpture — its parts can go anywhere (9,3)
6. Essentially, squares limit novelty meaning for final word (4)
7. Beginner mustn't do anything wrong (6)
8. What unexciting clues have, obviously (2,6)
9. Setter's cad? Liars can be unstable elements (4,8)
10. It helps produce number one three-act play (8)