Cryptic crossword No 2,512

Across

1. Foreign former leaders of the international circuit taking over (6)
2. Postman's round (4)
3. ...to begin to find fun in golf (3,8)
4. Fantastic round set me free... (10)
5. Forever lacking introductions, put off agreement (8)
6. Calm and happy, made the grade (8,2)
7. Head nympho's demand? (4)
8. Rocket scientist doing it gravity-free? (6)
9. Wheat in gluten-free sandwiches worrying (6)
10. Quality hampers providing delicacies (8)
11. Say Poirot's a Labour legend? (8)
12. Nothing clear about her pronouncements? (6)
13. Where to go to get a hit kitsch accessory (4,4)

Down

1. What is laid up in store for safe keeping (7)
2. Illness reportedly passed quickly (4)
3. Naked France ride off (6)
4. Cool off (7)
5. Juliet in Verona, a goddess (4)
6. Occasionally spread a bit of fun, like proper setters? (8)
7. Create most irregular verse forms (10)
8. Cured fish for dog? (8)
9. Theatre as one's scene of crime (7)
10. State police demand decorative band (6)
11. Mark 3:14 exactly? (7,3,5)
12. Buzzer's pressed in frantic quiz game (7)
13. Call girl's taken by mark (10)