Cryptic crossword No 3,540

Across

1. Hallucinogenic plant very regularly tucked into marijuana and ecstasy (6)
2. Conceal skin (4)
3. Medicine ultimately spilled on carpet (4)
4. Mostly horse-like plow-animal chases raven flying by head of lettuce - a perfectly balanced March day (6,7)
5. Mark raised with English lieutenant (4)
6. Mud-soiled bobcat rolling in a tizzy? (15)
7. Jet crashing over London - bail out! (5)
8. Stew made from inedible candy? That smells awful (5)
9. Disgusted reaction to headless waterfowl by edge of bay (4)
10. Old Italian jerk, one with vivacity, having unrealistically sentimental perspective (13)
11. Throw back in pair of aces following standard trajectory (8)
12. Understand American desire to coexist peacefully (3,5)
13. Baked goods nearly forgotten when crossing avenue (6)

Down

1. Time to throttle fish (5)
2. Set member up (3)
3. Little bird caught wings of young on trap (6)
4. Summoned to court more than once for physical damages? (8)
5. Some intercom maintenance creates interruption in speech (5)
6. Clumsy acquisition secured by one French library on the margins (8)
7. Misspelling capital "Y" is extraordinary (8)
8. Ambassador to appreciate having victory over judge (5)
9. Collected works of Escher unveiled vividly at first in stone (6)
10. Frequently a component of roof tiles (3)
11. Socialist informant in charge of method of inquiry? (8)
12. Angels, harpies wrestling on mountain's peak (8)
13. Playground equipment holds power to prepare those belonging to us to set out into the world (6,4,5)
14. Plastic splotches gathered on books with covers removed (8)
15. Prohibit university holding first of talks on African languages (5)