1 Dental amalgams (8)
5 Elevated open grasslands (6)
9 Insinuation (8)
10 Phlegm (6)
12 Hoodlums (9)
13 Unmoving (5)
14 Decreases (4)
16 Lap (7)
19 Souvenir (7)
21 A support or foundation (4)
24 Release (2 words) (5)
25 A young chick (9)
27 Relating to the iris of the eye (6)
28 A term of imprisonment (8)
29 Muzzled (6)
30 Imposes (8)
Down
1 Refrigerator (6)
2 Material used as backing (6)
3 Parts (5)
4 Contraptions (7)
6 Photographs (9)
7 Rubble (8)
8 Model (8)
11 Millisecond (4)
15 An aluminum silicate clay (9)
17 Refining metal (8)
18 Giving off (light, heat, radiation) (8)
20 Hawaiian island (4)
21 In an interval (7)
22 The Six Million Dollar Man (6)
23 Concurs (6)
26 Inn (5)