Cryptic crossword No 4,001

Across

1. Take wage up front for immigrant (7)
2. Advanced braille decoded (7)
3. In all, I’m in alcoholic’s borderline state (7)
4. Next, a length sideways (7)
5. Failure’s more pressing when failing at the outset (5)
6. Bottoms of trees may be square (5)
7. Two foreign articles about proposal for Finn perhaps (9)
8. 😂 Inhaling a short cigarette from the wrong end reasonable (7)
9. Either side of 50% really (3,4)
10. Difficult place to retire to? (7)
11. Terrible Ivan’s rule overarching (9)
12. Old Athenian fretwork stripped back (5)
13. Notice headless maiden in gloomy surroundings (9)
14. Medium range objective for Michelangelo in the Vatican? (5)
15. Goth spilt bubbly to get public attention (9)
16. Lying about part of repertoire, eh? Careful until next time (7)

Down

1. Naughty nibbles? (7)
2. Taking ecstasy in party, behave like a pirate (5)
3. Non-fattening bar? (5)
4. Raise bottle for small, reliable comforter (9)
5. After throwing up in Transit I locate reason for tummy upset (7)
6. Poetic licence you rarely indulge can actually liberate first of all (7)
7. Butcher’s bit of precious fat (5)
8. Tongue-like fish under aquarium light, only the heads showing (7)
9. Sinister fleets did split (4-5)
10. School play space (9)
11. Concerning words in law- laic interpretation (7)
12. So liar misrepresented ‘trousers art’ of tailor (9)
13. Once saw well-known dog controlled by lead (7)
14. Army unit with no time for planned therapy (7)
15. I’ll tear apart gospel (7)
16. Behold seed substitute (5)