Cryptic crossword No 3,645

Across

1. In the office, catching glimpse of Renaissance painting, maybe (7)
2. I toast to the primarily drunk person, making lasting impressions? (9)
3. Mastermind fully keeps alert (7)
4. Calculated buffet at deli stocking leftovers at opening (7)
5. Retiring swimmer pursues golf for pleasure (4)
6. Handle tea & cake for Brahms and Liszt (4,4,2)
7. Aboard a ship, left dock (4)
8. Head to where the Spanish show up, it's nice when warm? (7)
9. Paid back- for example- returning diamonds after he leaves paradise (7)
10. Liquor old writer almost put in tea (7)
11. Perhaps cut-throat one who lifts escaping from trap (5)
12. Covering for Pope Leo in mix-up, eating variety of fruit skin (6,4)
13. Pawn I blunder let opponent's finale in- it may be too late? (3,6)
14. As a bonus, briefly managed to follow previous time (5)

Down

1. Delicate petal blowing softly around this place (8)
2. A badger relaxed (2,4)
3. Female deer picked up bucks (5)
4. Limits sleep and showers (9)
5. Pet butterfly? (6)
6. Something unpredictable did crawl around (8)
7. Seafood to start- £1 calamari (5)
8. Wealth’s regularly polled? No thank you (6)
9. Snake’s finally back in Great Britain, swallowing most of cow and tailless rat (4,5)
10. Heartlessly knock down one street with small, blossoming businesses (8)
11. Man with many hats, caps from Adidas, and denim jackets, all for dancing (4-2-3-6)
12. Skilled artists organise clothing line on the counter  (8)
13. Phoenix’s state (Arizona) entered into database section, missing initial letter (6)
14. Basic dart arrow's flight scoring 50, amazingly (15)