SOLUTION BELOW
ACROSS
1 Theatre guide (5)
4 Make a mean and unfair attack (3,5,3,4)
14 Takes notice of (5)
15 Assess (5)
16 Predecessor (10)
17 Male relation (5)
19 Age (3)
20 Attired (7)
21 Damage the reputation of (9)
22 Dam-building animal (6)
25 Appalled; nauseated (9)
27 Young swan (6)
28 Warmed up (6)
33 Building for plants (10)
35 Long fish (3)
36 Capacity (6)
37 Unit of length (4)
39 Sheltered side (3)
41 Suspended (7)
42 Sully (6)
43 Rigidity (9)
44 Small group of trees (5)
45 Annual celebration (8)
50 Plural pronoun (2)
51 Seemly (8)
55 Tobacco pipe (5)
58 Childish (9)
59 Boat weight (6)
60 Make nervous or agitated (7)
61 Circuit (3)
63 Certain (4)
64 Chewed at (6)
65 Pockmark (3)
66 Easy; undemanding (10)
68 Earthquake (6)
69 Higher in rank (6)
71 Seized by legal right (9)
76 Prize winner (6)
77 WWII leader (9)
79 Race official (7)
81 Mineral spring (3)
84 Oyster gem (5)
85 Scaled-down copies (10)
86 Heating apparatus (5)
87 Doors out (5)
88 Beyond redemption; hopelessly corrupted (6,2,3,4)
89 Fireplace (5)
DOWN
2 Steps (6)
3 Margins (5)
5 Golf club (4)
6 Honey source (7)
7 Inaugurate (6)
8 Flinch (5)
9 Small fish (7)
10 Depressed (4)
11 Jewellery item (6)
12 Cut (5)
13 Got away (7)
14 More weighty (7)
18 Extended (10)
23 Offspring (5)
24 Hermit (7)
26 Intuitiveness, awareness (7)
27 Educational institution (7)
29 Citrus hybrid (7)
30 Acid neutraliser (6)
31 Risk (5)
32 Have a tipple (6)
34 Watches (4)
36 Poison (5)
38 Seed covers (5)
40 Frizzy hairstyle (4)
45 Ecstasy (5)
46 Adjudicator (7)
47 Sharpen (4)
48 Saline (anag) (6)
49 Capitulate (5)
50 Paper cover (7)
52 Treat with chlorine (10)
53 Firmness of purpose (7)
54 Anxious (6)
55 In the interval (7)
56 North Britons (5)
57 Witticism (4)
62 Going on (5)
67 Tongs (7)
68 Kitchen appliance (7)
70 Barbarous (7)
72 eg. slug, snail, mussel (7)
73 Root vegetable (6)
74 Give a pasting to (6)
75 Neckwear (6)
76 Genuine (5)
78 Piece of music with repeating refrain (5)
80 Irrigate (5)
82 Secret plan (4)
83 Rip (4)