Cryptic crossword No 3,465

Across

1. With no end of difficulty, they start to laugh about dilemma (3,5)
2. Maybe Dover Beach sees Arnold discontented struggling with faith essentially (7)
3. Son absorbed by duty (3,3)
4. Seafood's left to the right beside sink to chill (4,4)
5. Good man occasionally takes turns and hoovers (4)
6. It's said papers exaggerated position within Church (5,5)
7. Feeling lacking in schooling (7)
8. The question of dental deposits becoming early sign of gum disease (6)
9. Adult weightlifters taking heart from using Vaseline cleared chafing (8)
10. Great work with lines including ass in horseplay (10)
11. Article on spot or boil (6)
12. Toy boy that's behind alter ego? (4)
13. Snakes in summer sun? (6)
14. Waffles in letters written after receiving scare (8)
15. Lacking foresight, compiler's work with Independent beginning to age (6)
16. They might be committed backing mother with helpless maiden (6)

Down

1. Very old man admitting mistake in the end (4)
2. Wake up Clive, naked between two nurses (7)
3. Accepting the facts of kingdom that is kept divided (7)
4. First signs of the end: monsters, scourges and hurricanes (8)
5. Pilot that inevitably lands with conviction? (4,5)
6. Old Bishop's place has nothing inside (6)
7. Welcome icy weather (4)
8. It can rub when cycling chilly (5)
9. Maiden spreads legs now and then? (5)
10. Ruler at home throwing weight around (4)
11. It can get broody with wife on top. I've had enough (4)
12. Peeling off outer layers get out belly (3)
13. Great starter - finished too soon - that might leave one aquiver? (9)
14. That guy harvests no good plants (8)
15. Baser fetishes trapping person in a life of bondage (4)
16. Bloke’s drink in The Queen Vic? (3)
17. One carrying the weight of the world close to rest, finally (2,4)
18. Married and head over heels, say, about get together (5)
19. Bird decapitated rodent by lake (5)
20. Drug getting into boy's head (4)