Cryptic crossword No 3,490

Across

1. Twist of speech impediment in which 'L' is replaced with 'W'? (4)
2. French hazelnut plant's eclipsed by Portuguese night (8)
3. Decline from bad back, on the verge of death (5)
4. Inseam’s cut, so finally, linen's on the racks (2,6)
5. No mother to hug, for example (8)
6. Fell sick by hospital (4)
7. Atheist's exhausted by Christian observance inspiring government hours completely (2,6)
8. Old quack’s experiment with mice involves pliers occasionally (7)
9. Son’s playing part of husband in Hamlet — a little fishy? (6)
10. Ignore menacing bears beginning to stalk Yank around (9)
11. Rice Uni's last to back graduates confronting maths out of high school (7)
12. Get rat-tail, shaving sides and top of noggin (6)
13. Any senior, in a way? (2,2,5)
14. America’s overwhelmed by ruler being a wild ass (5)

Down

1. Close books a long time before start of lecture (7)
2. God's returning me back to ground strengthened (5)
3. I oscillate around areas (10)
4. Patient woman of legend starts to get restless if Dale's being annoying (8)
5. I drink, getting interrupted by male worker — "Dear?" (9)
6. Wearing shirt with hemp stripped together (2,6)
7. Paid amateur improves after losing versus drunk (4-3)
8. Oddly, A’s can be unwanted marks? (4)
9. Instruction from a wygienist? (4)
10. Mermaid's heart-broken from salmon being treated as shark bait (5)
11. HDMI cable regularly used for controller? (4)
12. Imam's tunic is made out of paper? (10)
13. Train alternative that is Elon's latest Tesla? ETA's going up (9)
14. Text of old adult dons: "OMG! Incorrect!" (4)