Solution to 4D has been deliberately left unsolved and is to be answered by a non-regular/novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.
Open for anyone to answer, if not solved by 1 PM.
ACROSS
1 European rule about controlling disorder (8) ROMANIAN {R}{O{MANIA}N}
5 Make bile go away (6) OBLIGE*
9
Think of subordinate - one
tense and worried (8)
COGITATE {COG}{1}{T}{ATE}
10 Most safe to consume English drink (6) COFFEE {COFFEr} over {E}
12 Fully renovated hotel hit by onset of tempest (2,3,4) TO THE HILT {HOTEL+HIT}*{Te...t}
13 Feel sorry for killing
river
bird (5)
EGRET rEGRET
14
Infection from du
st?
Yes (4)
STYE [T]
16 Drive around short mountain to reach green light (2-5) GO-AHEAD {GOA{HEAp}D}
19 Ponder about complex part of maths equation (7) OPERAND {PONDER+A}*
21
Box daughter lost in hut (4)
LOGE LO
dGE
24 Joseph's eldest son, universe's saviour primarily! (5) JESUS Acrostic &lit
25
General requests drop of
alcohol to be avoided in ship,
tossing and turning (9)
SLEEPLESS {S{LEE}{PLE
aS}S}
27 Screen in the auditorium is an electronic device (6) SENSOR (~censor)
28 Duke dies sadly, having personal problem (8) DOWNSIDE {D}{DIES*} over {OWN}
29 Lives with bigoted people, shunning society (6) EXISTS sEXISTS
30 So hot... under fan for cover (8) ENSHROUD {SO+H+UNDER}*
DOWN
1 Say aloud: "Replace power with time in formula" (6) RECITE RECI(-p+t)TE
2 Powerful man scores four - cutting square finally (6) MIGHTY {M}{eIGHTY}
3 Salt damaged retina, mostly (5) NITRE RETINa*
4 On both sides of compound, raise deciduous trees initially (7) A?T?I?E (Addendum - ASTRIDE {RAISE+De...s+Tr..s}* - See comments)
6 Report describing
old,
more explosive
missile (9)
BOOMERANG {B{O}{MORE*}ANG}
7 Popular one-time
singer? (8)
INFORMER {IN}{FORMER}
8 Following program, party leader leaving at 6 p.m. say (8) EVENTIDE {EVENT}{sIDE}
11 Men only raise guns (4) STAG<=
15 Coach losing one football, say, in ship (9) TRANSPORT {TRAiN}{SPORT}
17
Son's boring project - going through
tome, struggling to get
the perfect word (3,5)
MOT JUSTE {JU{S}T} in {TOME*}
18 After endless suffering, collapse near
India's
capital (8)
HELSINKI {HEL
l}{SINK}{I}
20 Run a little (4) DASH [DD]
21
Rest of
German song now remixed (3-4)
LIE-DOWN {LIED}{NOW*}
22
Come running to welcome team in
country (6)
MEXICO {ME{XI}CO*}
23 Section of m
ost endearing
city (6)
OSTEND [T]
26 Energy drink made from fruit (5) PUNCH [DD]
Reference List
Rule = R, About = ON, Tense = T, English = E, River = R, About A, Daughter = D, Ship = SS, Duke = D, Society = S, Hot = H, Power = P, Time = T, Man = M, Four scores = EIGHTY, Old = O, Popular = IN, Son = S, India = I