1 Underground experiment precedes what's needed in the lab (4,4)
5 Hotel welcomes policeman with a hot meal (6)
9 Sort of constant girl providing happy ending (8)
10 Figurative 23 getting no return on vehicles (6)
11 Man hugs soft tree (5)
12 Guarantee working for old city which sounds similar (9)
14 Pressure to replace nobleman's line coming from figurative 23 (4)
15 Chemist stocking drug for stars (6)
19 Magic potion for short golfer with 9-iron not working (6)
20/3 Drink expert brews teas during cold weather (4,6) (4,6)
24 Newscaster having setback in race's final stage (6,3)
25 Regulator has grain covering empty furrow (5)
26 One in business follows sister to be a messenger (6)
27 Relaxed man eating awful bun to get browned off? (8)
28 Country rube gets the green light from 23 (6)
29 One sharing toys puts Winehouse back in the picture (8)
1 Edge up to the heartless copper concealing small 5 (8)
2 Normal beginning for Spooner in leading role (4,4)
3 See 20 Across
4 23's cattle invoice (7,4)
6 Good order for head of cattle? (8)
7 Hospitalised European is bonkers (6)
8 Breton city's new workers have a point (6)
13 5 left shortly after subtitling went awry (7,4)
16 5 found hiding up in Sierra del Palomino region (8)
17 Reportedly employ revolting peasant, having arranged initially for 5 (8)
18 Mischievously tease the sensitive fellow (8)
21 Small dose of arrowroot in mixed drink will make you fat (6)
22 Third-rate police station said to be very pretty (6)
23 Builder taking dangerous short-cuts will scare child (6)
1 Underground experiment precedes what's needed in the lab (4,4)