Cryptic crossword No 1,820

Across

1. Every time leaving school (4)
2. Stray half as loud naturally (2,6)
3. Mocked no-good grid I clued badly (9)
4. Split hearts, being heartless (5)
5. Latest in Nintendo forbidding Pong (5)
6. Streams remixed covers: final pieces from Pulp and Boney M, for example (9)
7. Initially few of us at far edge of cliff left to escort one going to bluff (4-7)
8. Yankee drew nicest shot and ran (9)
9. Many lonely residents stocking material (5)
10. One Parisian ahead of westbound Soviet sub (5)
11. Football star returns with anthems, snubbing clubs with beasts on the field (9)
12. Grind hole, ignoring hole at ship's stern (8)
13. Taps into energy over sound again (4)

Down

1. Transmission of '30s film star by holding tablet (7)
2. Verdict oddly dropped, charging corrupt office - base gets chilling wake-up (4,6)
3. Ash & Ron broke up and repeatedly got back together for holiday (4,8)
4. Spoken, heard, spoken (4)
5. Queen of detectives disheartened chasing Jack two directions to find American's gems (7)
6. Hunter failed to eat slice of yak, passes old farts (5-7)
7. Bishop has ultimate in protocol for everyone left trapped by sins: fess up to get to heaven (12)
8. Everything essential to racing motorcades resuming velocipede exercise, unless it goes around the Triangle (12)
9. Top bananas lent truck to go around Spain (10)
10. One standing by Knight's sample from Newcastle's Quireboys (7)
11. Those confused after playing standalone game (3-4)
12. Fool policeman over opening of the last letter (4)