Solutions

ACROSS
1 Kilogram.
K(I+L+O+G)RAM
9 All-clear.
ALL+CLEAR
10 Psst.
PS+ST
11 Orthodontics.
(anag.)
13 Heathens.
H+EAT+HENS (ate anag.)
15 Thrace.
TH+RACE
16 Hyde.
(hide hom.)
17 Sword.
(hidden)
18 East.
E+A+S+T
20 Dublin.
D(U)BLIN (blind anag.)
21 Cardinal.
CA(R+DI)NAL
23 On bended knee.
ON+BEN+DE+D+KNEE (Ed rev.)
26 Moor.
M(O+O)R
27 Entrance.
ENT+RA+N+CE (ten anag.)
28 Demented.
DE(MEN+T)ED


DOWN
2 Insanely.
(anag.)
3 Out of the blue.
(two meanings)
4 Rattle.
RATTLE(r)
5 Mayo.
MAY+O
6 Allotted.
ALL+OT+TED (to rev.)
7 Deli.
(anag.)
8 Prospect.
PRO+S(P)ECT
12 Three wise men.
(anag.)
14 Stoic.
STO(I)C (cots rev.)
16 Hydrogen.
(anag. without u)
17 Sand-dune.
SAND+DUNE (nude anag.)
19 Stallone.
STALL+ON+E
22 Ransom.
(anag.)
24 Bats.
(two meanings)
25 Dyed.
(died hom.)