No 13835, Monday 10 Apr 2023, Incognito

Solution to 1D 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

7   Broadcast idea on air for show showcasing some answers in this puzzle (Continued in 9 Down) (4,5) AERO INDIA*

8   Common people organise Ohio poll before fourth of April (3,6) HOI POLLOI {OHIO+POLL}*{aprIl}

10 French love including right mail (6) ARMOUR {A{R}MOUR}

11 Bets wind moves around bedroom furniture perhaps unsuitable for Chang and Eng (4,4) TWIN BEDS*

12 "Doctor, sick boy having sex appeal makes boring device" (5,3) DRILL BIT {DR}{ILL}{B}{IT}

14 Juliet gets a bean for South American cat (6) JAGUAR {J}{A}{GUAR}

16 Gruesome female horse circles taxi (7) MACABRE {MA{CAB}RE}

18 Successive rulers from a family, I hear, pass away... Horrible! (7) DYNASTY {(~die)DY}{NASTY}

21 Native American having information about knock-out (6) DAKOTA {DA{KO}TA}

23 Yankee leaves military music groups for making sashes to be worn around upper limbs (8) ARMBANDS {ARMy}{BANDS}

25 For example boxing fruit on broken thing (8) FIGHTING {FIG}{THING*}

27 Irritated Nero captured soldier in province (6) REGION {RE{GI}ON*}

29 Extraordinary night amidst fish giving natural discharge of electricity (9) LIGHTNING {LI{NIGHT*}NG}

30 Observed new bishop's domain at first (4) SEEN {N}<=>{SEE}

DOWN

1   Rare rat bits strewn around one in seal-able glass containers containing soil and plants (8) ?E?R?R?A (Addendum - TERRARIA {RARE+RAT}* over {1} - See comments) 

2   Therefore, see alone (4) SOLO {SO}{LO}

3   Angel and actress endlessly getting massage (6) CHERUB {CHEr}{RUB}

4   Give orders to socially engage around Indian court (7) DICTATE {D{I}{CT}ATE}

5   Flashy person's Jap pony galloping around island (8) POPINJAY {JAP+PONY}* over {I}

6   Flat piece found in physics laboratory (4) SLAB [T]

9   See 7 Across (5) 

13 Perhaps, plain bit of gorilla nostrils (5) LLANO [T]

15 Chinese living in Georgia and an African country (5) GHANA {G{HAN}A}

17 About directories of the most successful pragmatists (8) REALISTS {RE}{A LISTS}

19 Do petals transform into pollywogs? (8) TADPOLES*

20 Watering hole profit? It's a snip (7) BARGAIN {BAR}{GAIN}

22 Pivotal part of taxi alcove (5) AXIAL [T]

24 Optical illusion from image shifting around centre of the Sahara desert (6) MIRAGE {MI{R}AGE*} Seems to be an error here for Anno of R (Addendum - {MI{t...aRa...t}AGE*} Semi&lit - See comments)

26 Very big embrace by Earl (4) HUGE {HUG}{E}

28 Surprised and sudden intake of breath from girl sitting on snake (4) GASP {G}{ASP}

Reference List

Right = R, Boy = B, Sex appeal = IT, Juliet = J, Bean = GUAR, Knock-out = KO, Yankee = Y, New = N, Bishop's domain = SEE, See = LO, Indian = I, Court = CT, Island = I, About = RE, Earl = E, Girl = G