1 Periods of 10 years (7)
5 Constantly present (7)
9 Woefully inadequate (9)
10 Helmet shaped (5)
11 Wedge-shaped (7)
12 Exchanging (7)
13 Baseball infielder (9)
15 S S S S (5)
17 Destined (5)
19 Balls of steamed dough (9)
22 Away from the wind (7)
25 An ancient middle-eastern people (7)
26 Consumed (5)
27 Lacking in refinement (9)
28 A peninsula of Central America (7)
29 Methods, schemes, procedures (7)
Down
1 Declares under oath (7)
2 Ruthless (9)
3 Inoperative (7)
4 Invited (9)
5 North African country (5)
6 Demean (7)
7 Prefix meaning more than one (5)
8 Alterations (7)
14 Brochures (9)
16 Consortium (9)
17 Incorrectly (7)
18 Trawl net (7)
20 Snailmail messages (7)
21 Detectives (7)
23 Sword (5)
24 Condescend (5)