1 Donor (14)
10 Unwind (5)
11 Apply grease or oil (9)
12 Cocktail (7)
13 Ancient Greek or Roman warship (7)
14 Violent disturbances (5)
16 Right away (9)
19 Bungle (9)
20 Mistake (5)
22 A deficiency of vitamin D (7)
25 The period when the king can't govern (7)
27 Example (9)
28 Guarantee (5)
29 Otherworldly (14)
Down
2 Extremely funny (9)
3 Seventy-two in Roman numerals (5)
4 Negated (9)
5 Custom (5)
6 Come into existence (9)
7 Picture (5)
8 Because of that (7)
9 An introductory textbook (6)
15 Impudent (9)
17 The leading military unit in an attack (9)
18 Large hairy tropical spider (9)
19 Harshly ironic (7)
21 Musical beat (6)
23 Drink served with marshmallows (5)
24 Elan (5)
26 Donated (5)