No 13213, Monday 05 Apr 2021, KrisKross

Solution to 18A has been deliberately left unsolved and is to be answered only by a non-regular / novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.

ACROSS

1   Greeting of peace to welcome king is a custom (6) PRAXIS {P{R}AX}{IS}

4   Go over cover, running one single again (8) DIVORCEE {DI{COVER*}E}

10 Queen going through hectic schedule becomes subdued (9) SQUELCHED {S{Q}UELCHED*}

11 Blue design of quartz panel, oddly chipped (5) AZURE {qUaRtZ+pAnEl}*

12 South American most smart and thin (7) CHILEAN {CHIc}{LEAN}

13 Wish a foreign student — one from East Africa (7) SWAHILI {WISH+A}*{L}{1}

14 Authentic clothing — grand and majestic (5) REGAL {RE{G}AL}

15 KrisKross is stabbing a friend, showing hatred (8) ACRIMONY {A}{CR{I'M}ONY}

18 Friendliness of group about to paint new house, empty inside (8) ?O?H?M?E (Addendum - {BO{N}{HO}M<=}{In..dE} - See comments)

20 In Tijuana, choesn fast food (5) NACHO [T]

23 Indian language adopted by Singapore’s party (7) SHINDIG {S{HINDI}G}

25 Song stuck in head — “One city” (7) NAIROBI {N{AIR}OB}{1}

26 Order from the dictator (5) EDICT [T]

27 Feeling piqued and tense, going around in circle (9) RESENTING {R{TENSE*}ING}

28 Married soldier reaches Asian country directly (3,2,3) MAN TO MAN {M}{ANT}{OMAN}

29 Fellow’s dangerous like a cat (6) FRISKY {F}{RISKY}

DOWN

1   Office comedian is one with a message for everyone to see (8) POSTCARD {POST}{CARD}

2   A thoughtful comic (7) AMUSING {A}{MUSING}

3   Sick condition of all the legendary, iconic leaders treated at hospital (3,6) ILL HEALTH {Le...y+Ic...c+Le...s}*{HEAL}{AT}{H} (Addendum - {ALL+THE+Le...y+Ic...c}*{H} - See comments) 

5   Lack of judgement from Einstein — dress wrinkled around top of collar (14) INDISCREETNESS {EINSTEIN+DRESS+Co...r}*

6   Part of America, after chanting, gets expression of enlightenment (5) OMAHA {OM}{AHA}

7   Alert Charlie taking the lead in sale (7) CAUTION (+c)CAU(-c)TION

8   School lied about the old pupil, protected by this (6) EYELID {E{YE}LID*}

9   Dream sequence where maharanis go tap-dancing (14) PHANTASMAGORIA*

16 High priest tuned morsing without playing (9) MONSIGNOR {MORSING}* over {ON}

17 Old royal left wearing jersey inside out, for fun (8) JOKINGLY {O}{KING}{L} in {Je..eY}

19 Take short needle to cut vegetable (7) OPINION {O{PIn}NION}

21 Poor sweetheart sick after eating eggs and biscuits (7) COOKIES {swEet+SICK}* over {OO}

22 European model meets judge (6) ESTEEM {E}{MEETS*}

24 In short, do the same (5) DITTO [do/ditto]

Reference List

King = R, Queen = Q, Student = L, Grand = G, New = N, House = HO, Married = M, Fellow = F, Hospital = H, Charlie = C, Old = O, Left = L, European = E