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ACROSS
1. Distribution of light and shade in a picture. (11)
7. Carothers' protein-like fabric. (5)
8. Native American at 2 down. (5)
9. Slut like authors Joanna and Anthony. (7)
11. Annoying distressing ordeal. (3)
12. Receive encouragement on head from cow's arse. (3)
14. Rolled it in a donkey round a savoury filling. (7)
16. Butcher's face cloth. (5)
17. Holy man without stain. (5)
18. Picture presentation of human population. (11)
DOWN
1. Couldn't give a shit. (11)
2. Cold house for 8 across. (5)
3. Stand for athletic election. (3)
4. Captain into jumping ropes. (7)
5. Fleshy part of palate that hangs in the back of the throat. (5)
6. Concerned with correcting irregular teeth. (11)
10. Throwing football high in the air. (7)
13. Purr of a motorcycle sounds like a percussion instrument. (5)
15. Native of the Land of Wrath. (5)
17. Watery expanse akin to a bishop's diocese. (3)