Cryptic crossword No 3,619

Across

1. Tuft of smoke conceals silver feathers (7)
2. Perching raven somewhat ominous (5)
3. Vegetable tolerable almost unprepared (4)
4. Oilseed crop seems jammier, oddly (6)
5. Warmly greet winter weather (4)
6. Freeze sketchy retirement funds (10)
7. Formerly invincible armory? (7)
8. Muscle tear exposed ends of limbic nerve clump (6)
9. First signs of stress and undergraduates long to be reclined (6)
10. Elizabeth sinned heartlessly, confronted by saint, corrected course (7)
11. Climbing equipment more or less functional at end of ascent (7)
12. The reptile, disguised, is a creepy tech billionaire (5,5)
13. Siberian cat reportedly lives here (5)
14. Time after time mishandling atom results in tumour (8)
15. Taint pure men I perverted (8)
16. Ukrainian city lost, shelled and overthrown (6)

Down

1. Ulcer's core component remaining once first third excised (7)
2. Crowd from Sweden friendly (5)
3. Last bit of home game (5)
4. Sherlock, for one, likes aspect of the metric system (9)
5. Deal gone awry, I got eaten (9)
6. The definition of this word is rude, we're told! (9)
7. Browbeat Reeves as term intruded upon by primarily ineffectual Starmer (9)
8. This might give you a bad head? (7)
9. Peacock emblem's crest of independent India's historic city (7)
10. Backwoods flower, one found in Russia (5)
11. No member of parliament intervening in price for fertiliser (7)
12. Bull that man's added into reference book (9)
13. Get very drawn in by sloe cocktail (5)