SOLUTION BELOW
ACROSS
1 Expel (5)
4 Intensive, even brutal interrogation (3,5,6)
11 Annoyed (5)
14 Concur (5)
15 Not lived in (11)
16 Unnecessary (8)
19 Tasted (7)
20 Long-term prisoner (5)
21 Unable to be heard (9)
24 Being part of (9)
26 Property (6)
27 Eight-note interval (6)
31 Openly disregard (5)
32 Realistic (8)
34 Imaginary or invented (10)
38 Reclaim (anag)(7)
39 Skin disorder (6)
40 Foreigners (6)
41 Enthusiastic (4)
42 Clings (7)
45 Praising excessively, insincerely (10)
50 Singer (7)
54 Religious song of praise (4)
55 Cheque presenter (6)
56 Historical records (6)
57 Police member (7)
60 Pay back, make restitution (10)
61 Unending time (8)
62 Confidence (5)
65 Jockeys (6)
66 Flights of fancy (6)
67 Indifferent (9)
72 Sleeping sickness-spreading insect (6,3)
73 Waterway (5)
74 Illustration title (7)
79 Industrial plant (8)
80 Numbing drug (11)
81 Start (5)
82 Tear into pieces (5)
83 Excessively delighted, gratified (7,2,5)
84 Answer (5)
DOWN
2 Multi-pieced puzzle (6)
3 Inexpensive (5)
5 Go in quest of (4)
6 Stress (7)
7 Pictures (6)
8 Fall in drops (4)
9 Uniformity (8)
10 Eye cover (6)
11 I cleaned it (anag)(10)
12 Leg joint (4)
13 Incapacitate (7)
17 Snake poison (5)
18 Cutting short, abridging (10)
22 Once more (5)
23 French emperor (8)
25 Teach (7)
26 Mediocre (7)
28 Associated (6)
29 Noiseless (6)
30 Of race (6)
33 Surpass (5)
35 Spanish Mr (5)
36 Smokestack (4)
37 Indian garment (4)
42 Detest (5)
43 Murder (8)
44 Meat pin (6)
45 Spark catcher (10)
46 Pretensions (4)
47 Merchants (7)
48 Circled (6)
49 Synthetic fibre (5)
51 Floating platform (4)
52 Paper-folding art (7)
53 Votes in (6)
58 Jailed (10)
59 Announce (5)
63 Gold dredge refuse (8)
64 Rot (5)
65 Comes back (7)
68 Level highland (7)
69 Agitate (4,2)
70 Predatory insect (6)
71 Gregarious (6)
75 Subject (5)
76 At a distance (4)
77 Nourish (4)
78 Metal in some sunscreens (4)