Cryptic crossword No 2,134

Across

1. It's loud and clear around Los Angeles, Rhode Island: nothing, North Carolina area: fifty-fifty (7,4) (11)
2. Huge matriarch emerges from cocoon (7)
3. Gives energy to horse (7)
4. Orlok's favourite tipple, maybe resulted in bleary eyes (9)
5. Purge cluttered treasure map marking  (5)
6. Fairy hit with a stick (4)
7. Mobilisation belies mass gatherings (10)
8. Appears uninvited old boy trapped in vaults is after Vietnamese bowl (10)
9. Get-togethers specifically including good medium (4)
10. Wizened journalist follows returning number one pupil (5)
11. Someone offering alternative route you missed, having ingested flipping LSD! (9)
12. For when you need to get back on the horse (7)
13. Flowers taken out of porch, I'd suggest (7)
14. Suppose he is posh yet troubled (11)

Down

1. Lineage of Nautilus skipper's dubious, missing namesake (6,9) (15)
2. Keep clear of rising star with nothing inside (5)
3. Holy Mackerel, perhaps!  (7)
4. Volatile kinetic energy lost current for smart accessory  (7)
5. What you might get from a loan shark, perhaps (1,3,4) (8)
6. One-off event, hopefully... (9,6) (15)
7. Three brothers sang 'me me me' without any echoes: hit! (6)
8. Public Relations line shows how things are done (6)
9. Pirate drove at sea, lacking velocity and without any energy for voyage (8)
10. Improve European (6)
11. Rare breed found in Dr. Foster's past haunt (3,4) (7)
12. Bedfordshire copper, maybe, pained from lack of movement (7)
13. Ragged break in ship's middle causing tension (6)
14. Prickly chief inspector covers naked truths (5)