8 Cancel or reverse an action (4)
9 Alcoholism (10)
10 Climb (6)
11 Airplane touchdowns (8)
12 Plunge (4)
13 Regarding highly (10)
17 At the back of an animal (4)
18 Similar (5)
19 Prefix indicating outer (4)
20 Objective (10)
22 Bee colony (4)
23 Critiqued (8)
27 Upper chamber in a legislature (6)
28 Imperishability (10)
29 Not odd (4)
Down
1 A first century heretical teaching (10)
2 A person easily angered (8)
3 Opinion pieces in newspapers (10)
4 Gemstone (4)
5 To thrust with a weapon (archaic) (4)
6 A masochist's need (6)
7 Male ruler (4)
14 Heir (5)
15 Spectacles (10)
16 Births (10)
19 Made better (8)
21 Riddle (6)
24 Sword (4)
25 Ebb (4)
26 By means of (4)