8 A curved structure spanning an opening (4)
9 Accords (10)
10 Veer (6)
11 Closeness (8)
12 Passport (4)
13 Gossamer (10)
17 Celebrate (4)
18 It travels on rails (5)
19 A euphemism for "Hell" (4)
20 Vibrates (10)
22 Trailer truck (4)
23 Without fault or blemish (8)
27 Not digital (6)
28 Sentry post (10)
29 Snake-like fishes (4)
Down
1 Sleepiness (10)
2 Less than expected (8)
3 Priestly (10)
4 Wild African sheep (4)
5 Repose (4)
6 Homily (6)
7 Relating to the ear (4)
14 Adjust (5)
15 The claspings of another's hands (10)
16 Exceptionally (10)
19 Captives (8)
21 Towards the center (6)
24 Klutz (4)
25 Reflected sound (4)
26 Self-satisfied (4)