Cryptic crossword No 3,280

Across

1. Stem and shoot containing nitrogen (6)
2. Exercising must essentially involve new goals at first (5)
3. Adder season (6)
4. Temporarily stop recording of decorated band (6)
5. Second stage (6)
6. Writer like I am, over half spent (6)
7. Constituent in steel in cut of spear- literally (8)
8. Stop dentist replacing adjacent caps of new teeth with single crown (6)
9. Implements delivered by pickup to Nova Scotia with International Logistics Services initially (8)
10. Astonished with weak crust after baking (9)
11. Rejected non-mutual covering for Fall (6)
12. Approve regular appearances in Bill’s next season (5)
13. Memorials of men carried by horses with twisted guts (9)
14. Main gaps exploited in practices like Wicca (8)
15. Take in what’s said as a joke (6)
16. Carefully record hiding wine by lady’s case (8)

Down

1. 75% indifferent? Save us! (3)
2. Invigorate school top to bottom building on winning position (4,2)
3. Relief given by one following endlessly alone (6)
4. Chinese way suggested by Irish PM’s three leading lights (3)
5. Wants what baker does reported (5)
6. Pandemonium channeled by Ishmael’s trombone (9)
7. Easter’s Advent near, gather round with favourite carol (6,5)
8. Discharge for publisher sightseeing: time to take a step up (10)
9. In France no worries as cousins abused (4,5)
10. Not the first time around Christmas yours truly comically dozing over bit of music (10)
11. A long time controlling horse with spur (3,2)
12. Old capital’s king is eventually vanquished with leaders taken (4)
13. Upturned Belvedere vodka bottles sign of peacemaker (4)
14. With first moment of fulfilment resulting in nostalgia (11)