SOLUTION BELOW
ACROSS
1 Boring (7)
4 Act prematurely (4,3,3)
9 Give sanction to (7)
13 Be priced at (4)
14 Tree-lined street (6)
15 Fleet of warships (6)
16 Shoe mender (7)
19 Sacrifice of one's own desires (4-6)
20 Support on stairway (8)
21 Had a meal (5)
24 Paradoxical (6)
25 Female parent (6)
27 Colleague (9)
32 Sleeveless apron-like dress (8)
33 Show off (6)
34 Bitter in taste (7)
38 Unending time (8)
39 Scared (6)
40 Sailor's shout (4)
41 Cove (5)
42 Thin porridge (5)
45 Fantasy of great wealth and happiness (7,2,5)
52 Ages (5)
55 Scoff (5)
56 Open-topped pastry (4)
57 Avaricious (6)
58 Production hold-up (8)
61 Hold (7)
62 Diminutive person (6)
63 Was curious (8)
66 Pen type (9)
68 Ambush (6)
69 Lemon acid (6)
73 Tastelessly bright (5)
74 Intrude unlawfully (8)
76 Help (10)
81 Plant piece for growing (7)
82 Counterbalance (6)
83 Leg-extending poles (6)
84 Bludgeon (4)
85 Feeling of anger from being offended (7)
86 Come up empty-handed (4,1,5)
87 Shared out (7)
DOWN
1 Small sharp nails (5)
2 Veto (8)
3 Economising (6)
4 Post-revolution ruling faction (5)
5 Submissive (4)
6 Tutor (7)
7 Stoat fur (6)
8 Beneath (5)
10 Ship's pointy bit (4)
11 Constructed again (7)
12 Television user (6)
17 Extra (10)
18 Climber's spike (5)
22 With a happy disposition (8)
23 Squeeze sharply, painfully (5)
24 Cold floating lump (7)
26 Wind instrument (4)
28 Indoor tanning device (7)
29 Strategy (6)
30 Set (6)
31 Homing bird (6)
33 Defects (5)
35 Wash soap out (5)
36 Bill of fare (4)
37 Mongolian desert (4)
43 Haphazard (6)
44 Upright (5)
46 Friend in war (4)
47 Stress (7)
48 Enter into battle with (6)
49 Bungling (5)
50 Crabwise (8)
51 Chat casually (6)
52 Increase in value (10)
53 Colourful gemstone (4)
54 Varnish resin (7)
59 Fatuous (5)
60 Girl's name (4)
64 Harass (5)
65 Crinkly (8)
67 Accounts checker (7)
68 Laundry sink (7)
70 Space devoid of air (6)
71 Polish capital (6)
72 Rejected by lover (6)
75 Up until now (2,3)
77 Smooth and glossy (5)
78 Implant deeply (5)
79 Hitch (4)
80 Continent (4)