Cryptic Crushword solution
by Kegler

Cryptic Crushword solution grid

Across
1R(E + SIGN)ED
4LICENSE PLATES (PLEASE CLIENTS anag)
9A + BB + REV + I + ATE
10ARBORETUM (hidden)
11LIT + MUST(TEST)S (SETS anag)
12GREAT DANE ("DATE GRAIN" spoonerism)
14A-TEST (TASTE anag)
15TRAiN(SPORT)ERS
18O + NEARME + D,B + AND + IT'S (MEN ARE anag)
20MI + NI + VAN
23PRINCE ("PRINTS" hom)
24ETIOLOGICAL (GAELIC I TOOL anag)
26PA(TRONE)SSES (TENOR anag)
27A + LIEN + AcTION
28YE + L(LOW + BELL)IED
29ST. RO(N)GER
Down
1R,E + HABI(LI)TATION
2IGNOR + AMUSES (RINGO anag)
3D(EVI)ATED (I'VE rev)
4LIBERTARIANS (BAIL ISN'T RARE anag)
5ENSNARE (rev hidden)
6PRO + CREATORS (REACTORS anag)
7A + T(TEND)EE
8SPU + MONEy (UPS rev)
13INSTITUTIONALIZED (UNTIL ZANIEST IDIOT anag)
16SCANDALMONGER (RANDOM GLANCES anag)
17MEDICI(N + E)S + HOW
19ARB + ITRAL (BRA rev; TRIAL anag)
21IN + elITIsm+ A + NATION
22S + O + O + NEST
23PA(PAC)Y
25RES(P)ELL