Cryptic crossword No 1,493

Across

1. Scouts frequently surrounded by many insects (7)
2. Tuffet in part of monastery over here replaced by usher at first (7)
3. One is engineered to produce sound (5)
4. Beginning with dining area inside (9)
5. Fitter pointer, originally missing, woofed (6)
6. Wife has puzzle book released (6)
7. Father's anger with Apple device - one no longer available anywhere (5)
8. Attempt to board in time (5)
9. Return drink - it's a disgusting liquid! (3)
10. Regular features of spring (3)
11. Secretary goofed bringing back note for messenger (5)
12. Beast to leave following uproar (5)
13. Lost Manx shearwater trashmen dumped that's found in canal? (6)
14. Crew accepting help (6)
15. Entertainer can depart after performing (3-6)
16. Sound high jumper might produce being on cocaine most of career? (5)
17. Wafer's new net cost (7)
18. Heal infection after wiping bottoms (7)

Down

1. Attack in fencing avoiding tip of epee (4)
2. Hot sausage roll made from caught boar stuffed with herb I pulled up (6,3)
3. Leaves to participate in kinky sex (5)
4. Acting as private investigator's beginning to leave (9)
5. Leafed stick held by Potter contains core of holly (4)
6. Unknown Norwegian paintings female hid found by journalist (9)
7. Criminal jedi's back shrouded by the Force (5)
8. Return land invaded by soldiers on ship (10)
9. Very angry people rejecting Europe protected by law and edicts essentially (10)
10. Riotous explosions initially deafen pals for a stretch by the sea (9)
11. Old criteria amended at end of meeting (9)
12. Writer to offend snubbed American in Florida? (9)
13. After grave words nurse's to turn red? (5)
14. Furnishings? Some corrode again and again! (5)
15. Feline chases last of rats off with you (4)
16. Stunt technique often used in drama club? (4)