Cryptic crossword No 3,169

Across

1. Repaired tramline leading to depot (8)
2. Eco-conscious type fighting regret about digital embrace? (4-6)
3. Well-organised teams taken apart in City's comeback (10)
4. Large number of vacant students in class obscured by grade inflation at first (6)
5. Environment in Michigan university stifles invention (6)
6. Wild youngster losing head in military base (4)
7. J.K. Rowling, say, lacking heart to push her former leader (8)
8. The Pope getting around America twice in secret (4-4)
9. Cut Northern flower (6)
10. Comparison suggested by setter wearing expression of amusement (6)
11. Change one's mind about period of abstinence (6)
12. Tea brewed with a sock? For breakfast up north maybe (8)
13. Sailor in watch second to identify Titanic's ultimate destination (6)
14. Secure with rope, twisted for leeway (4)
15. Kew's first border grass not the last British variant of Indian origin (8)
16. Increase efforts 300% in total? (8)

Down

1. Both sides of the house in a masculine appeal for attention (4)
2. Labour's end heralded by socialist majority as new beginning (7)
3. Spooner's simple club is the right place for a drink (4,3)
4. Two needed for kink? Looker comes round for after-hours treat (5)
5. Spoiler ruined the ending of Crash for buff again (8)
6. Sweet-sounding Gibson, maybe, with awful backing (9)
7. Fragments Cluedo’s Professor drew together (6,2)
8. Songster sounds like frontman Phil for one (6)
9. Mark's heartless talk about destiny (7)
10. Profligate poet (7)
11. Where tears are shed from solemn face (9)
12. Sliced meat in messy orgy - Scissorhand's first (5)
13. Perhaps 40% like boring afterthought (4)
14. Exposed bad habits underneath sober effect (3,3)
15. Footballer refusing to cross the line? (7)
16. It publishes king, for example (7)