Cryptic crossword No 3,704

Across

1. Plastic materials in plant (5,4)
2. One not entirely sheepish about using vanadium for animal testing? (2,4)
3. Isn't their website oddly good? (8)
4. Criminal (Russian leader Putin, essentially) rejected opposition (8)
5. Bread on the counter split between Jeremy and Zach? (4)
6. Issue of treason in which leader's deposed (7)
7. Tasty slushies primarily iced (7)
8. Dispute following chargeback of debt? (4)
9. Censored journalist follows communist decree (8)
10. Conservative king renounced by nonconformist Quakers (6)
11. Difficulty of driving car in city (9)
12. In play, the Bard wants brother's undoing (5)
13. Shirt tag cut for Frank (8)
14. Biannually, occasionally, everyday (5)

Down

1. One recoils eating Indian bread -- it's some spicy stuff (7)
2. Professor using ruler, etc. (8)
3. Blackmail text discovered by reporters' three innermost insiders? (6)
4. Somewhat described as having style (4)
5. Couple shared marijuana cigarette (5)
6. Palestinian place made fresh stew stock (4,4)
7. Powerful republican involved in con (6)
8. Elevated cock extremely sexily (5)
9. University degree voided after publication given "stupid" mark (9)
10. Note revolting "sex appeal" article written in Times is concealed (8)
11. Found veteran in tomb buried (3,4)
12. Understand class led by writer about central characters of Homeric folktales (9)
13. What’s used by troops and revolutionary nationalist crew regularly? (8)
14. Pine stump consumes nitrogen (4)