Cryptic crossword No 4,099

Across

1. South harbour emptied by mischievous child to get shellfish (6)
2. Gospel writer to campaign against Mass that's half-hearted (8)
3. I want her dancing with nothing on (2,3,3)
4. Delight in prayer with Saint Trace of Essex (6)
5. Funky cut of disco oldie (4)
6. I half drained her Tena pants to make an eau de toilette by Dior (10)
7. Kinky priest stuns LA boulevard (6,5)
8. Abundant pleasure in Southend on vacation with bit of skirt and stacks of dodgy cash (5,5)
9. Visited housing plot (4)
10. Tough old bird with second rate greaser (6)
11. Unsolicited approach from local Conservative and Liberal Democrat parties (4,4)
12. Raunchy letters in Playboy's team yearbook (6)
13. Spinners cover of Crazy top of charts ahead of Lulu's inaugural single Piece of Shit (8)

Down

1. Warm air central heating popular with old blokes essentially (7)
2. Sky features Blur cutting new records (4,6)
3. Out of bed and start to drop sloppy farts in thermals (8)
4. Chops and changes pipes connected to both taps (5,3,3,4)
5. Capital of Slovakia cops uncovered disembowelled judge (6)
6. Cute backside of modest wife seen naked (4)
7. Nuts rusty? I'd use this to keep the water out (3,4)
8. Mysterious loss in heat causing cold showers (10)
9. Legal precedent:☑️ (4,4)
10. Al Capone initially expressed surprise over origin of legit booze (7)
11. Blended teas with Mrs Burns (7)
12. Ceremonial horse bites King Mike (6)
13. Cover over back of patio water feature (4)