The Sunday Crossword No 3079, Sunday 22 Dec 2019

Found this tough with some obscure words.

ACROSS
1   Elected absurdity that only amuses some (2-4) IN-JOKE {IN}JOKE Anno for JOKE pending (Addendum - {IN}{JOKE} - See comments)
4   As to this charge: are you sure? (2,4,2) IS THAT SO*
9   Ditching North, retire to Piedmont location (5) TURIN {TURn IN}
10 Unconventional bunch of cheques for the auditor? (9) BOHEMIANS (from ~ czechs)
11 First two notes in wrong order? Try again (4) REDO {DO}<=>{RE}
12 Invested in 'About a Boy' (4) CLAD {C}{LAD}
13 Scottish speciality – flipping internal organ! – not liked at first (5) NEEPS SPlEEN<=
15 Determined chaps united to get food at agreed price (3,4) SET MENU {SET}{MEN}{U}
16 We're told massage is a necessity (4) NEED (~knead)
19 Ladies given latitude to opine online (4) BLOG {B{L}OG}
20 Little baby going around city causing rampage (3,4) RUN RIOT {RUN{RIO}T}
23 Country dancing yankee shaking behind (5) KENYA YANKEe*

24 Rascal, no-good rascal (4) ROUE ROgUE
25 Removing silver plating, asking to reveal surface (4) SKIN aSKINg
27 Expert put on weight for TV show (9) PROGRAMME {PRO}{GRAMME}
28 A Spanish greeting: in return, a Hawaiian greeting (5) ALOHA {A}{HOLA}<=
29 A fight? What might end a fight? (4-4) DING-DONG [DD]
30 Perhaps quark's revolutionary energy covering casing of electrons (6) CHEESE {CHE}{El...nS}{E}

DOWN
1   Bury the hatchet finally, suppressing second concern (8) INTEREST {INTER}{thE}{S}{h...eT}
2   Civic responsibility that might involve a lot of time? (4,4) JURY DUTY [CD]
3   Philosopher's hypocrisy is called out (4) KANT (~cant)
5   Send a rude chef out with malicious glee (13) SCHADENFREUDE* Solved using anagram finder
6   'Perhaps you smell sort of benign,' Australian admitted (5,5) HUMAN BEING {HUM}{A}{BENIGN*}
7   River Tees engulfing northern home (6) THAMES {HAME} in {T'S}
8   To dominate, bosses about (6) OBSESS*
10 Story with endless bile, filth's from Italian capital (13) BILDUNGSROMAN {BILe}{DUNGS}{ROMAN} Cheated on this one
14 Substantial raving cleared club (4,6) REAL MADRID {REAL MAD}{RID}
17 Learner quits close-knit organisation with excuse for opting out (4,4) SICK NOTE {ClOSE+KNIT}*
18 Wise to suppress mood when primitive men seen (5,3) STONE AGE {S{TONE}AGE}
21 Broadcaster with power: leading journalist made a high-tech connection (6) SKYPED {SKY}{P}{ED}
22 Joke's non-starter (cry of dismay heard) needing to be cut (6) UNMOWN {pUN}{MOWN}(~moan)
26 He wrote Lutheran Masses in Welsh, my friend (4) BACH [DD?] Anno pending See comments

Reference List
North = N, About = C, United = U, Latitude = L, Good = G, Revolutionary = CHE, Energy = E, Second = S, Australian = A, Learner = L, Power = P