Cryptic crossword No 3,913

Across

1. Gas is mixed before country rendezvous (11)
2. Offer support for a brief period (6)
3. Silver-tongued infection specialist (6)
4. Waterboarder is quietly fuming (6)
5. Occasionally plays it well in subdued tones (6)
6. Leeway given in parallel (8)
7. Lame duck at banquet (4)
8. Seems that Dad may be in play-off (10)
9. Slippery customers come back, sleeping noiselessly (4)
10. Insist that chief isn't vulgar inside (8)
11. Caution about promotion of deputy (6)
12. Contemplates criterion for being dead in America (10)
13. Spin doctor holds church hostage at intervals (6)

Down

1. Sabotages containers (8)
2. Sneakily gleans viewpoints (6)
3. Suspect recipe: stir mixture, sprinkle dust over (8)
4. Chant "Turn weapon around, soldier!" (6)
5. Rundown and sick of outlook? (8)
6. Talks best broken into sections (6)
7. Tells of setback after odd outputs from satnav (6)
8. Edmund passes on spins (6)
9. Giant rental scam on and off (11)
10. Repeats process of tearing up treaties (8)
11. 19 reportedly too wise about nobleman (6)
12. Cancel afternoon inside to find short-lived plant (6)
13. Raise legal point first (6)