Cryptic crossword No 2,372

Across

1. "Not sober enough" - addict promises to stay clean at last (9)
2. A right barney, or "quarrel" (5)
3. Tarquin's sure to jabber interminably with Henry (3)
4. Once again overwhelmed by band of showers in government trying to make the extreme seem normal (11)
5. Though unprepared, attempt decent (albeit half-hearted) fight back (6)
6. Modest dissent ending in compromise (6)
7. Wield authority without having power (5)
8. Did remarkably well in English (3)
9. Be on the alert during interview at checkpoint (5)
10. Anonymous satirist loses their head making garbage content (2,4)
11. Big city doctor heading to sleepy Ayrshire? (6)
12. Performing this outrageous act could lead to the creation of scenic tableaux (11)
13. Seed that's essential to each step of fashionable softmaxxing routine? (3)
14. According to the authorities, America's favourite assassin's a plumber! (5)
15. Touch of anachronism during very popular period drama (4,5)

Down

1. Part of an airport that reflects how your holiday should be? (4-4)
2. Avoid this guy when visiting Key West (6)
3. Whinge incessantly, holler noisily, and act irrationally when at one's limit (5,3)
4. Bit sticking out from side of hexagon? (4)
5. Gig that's attractive to vocalist (6)
6. High art: for the most part, boring rubbish that deadens the mind (8)
7. Doorstop's breaking down, getting covered in tiny nicks (3-5)
8. Reward a most excellent time?! (4)
9. Places one can go to learn about military police operations (8)
10. The gasp I gusped - me, bottom? Ultimately, I see a big problem! (8)
11. Predicament in which people start to give to the fullest extent (5-3)
12. Bird of prey, soaring high in the French Alps, makes a spitting sound? (4,4)
13. Starting late, arrive at work and enter a state of deep concentration (4,2)
14. Business gets sanctioned and irrevocably damaged (6)
15. In all likelihood, cocked up dispatch (4)
16. Term for hedonist, with origins in (briefly) relevant album (4)