The Sunday Crossword No 3074, Sunday 17 Nov 19

ACROSS
1   Dullest dullard overwhelmed by exam (8) THICKEST {T{HICK}EST}
5   Fish by river, finding one gliding on surface (6) SKATER {SKATE}{R}
10 Entertaining literature: primarily, a deep source? (5) MILNE {MI{Li...e}NE} &lit
11 Hints end in sight amid unions' disruption (9) INNUENDOS {INNU{END}OS*}
12 Giving a name to mouse-pony hybrid (9) EPONYMOUS*
13 Year on island, topless resort (5) YALTA {Y}{mALTA}
14 In conclusion, Guinness sells these! (6) STOUTS {g...eS}{TOUTS} &lit

15 Impartial head of Ireland ignored in new EU test (7) NEUTRAL {N}{EU}{TRiAL}
18 Consume fruitcake with a bit of salad (4,3) PINE NUT {PINE}{NUT} Chilgoza in India

20 Stingy; losing pound will get you grief (6) MISERY MISERlY
22 Half of theological colleges regressive in Languedoc city (5) NIMES SEMINaries<=
24 Having branches cut back to make room for using the net (3-6) NON-LINEAR {RAN}<= over {ON-LINE}
25 Arid broadcast from our station (5,4) RADIO FOUR {ARID*}{F}{OUR}
26 Primarily, text orthodox rabbi always honours? (5) TORAH Acrostic &lit
27 Father Christmas, catching cold, retreats (6) SANCTA {SAN{C}TA}
28 Drinks Australian ingested, displaying signs of overindulgence (8) PAUNCHES {P{A}UNCHES}

DOWN
1   Soften, harden (6) TEMPER [DD]
2   Telling off about part of Bible having been ripped off (3-6) ILL-GOTTEN {TELLING}* over {OT}
3   'Back off: yes? No?': Europe to UK, confused (4,4,4,3) KEEP YOUR NOSE OUT*
4   Impudence. Boy on Sabbath's clothing: comfy shoes (4-3) SLIP-ONS {S{LIP}ON}{S}
6   Observe horny suitor fumbling: 'Cool it!' (4,4,5,2) KEEP YOUR SHIRT ON {KEEP}{HORNY+SUITOR}*
7   Every so often, third yawl finds a kind of large wave (5) TIDAL {ThIrD}{yAwL}
8   Naughty, vandalising cars with mate (8) RASCALLY {CARS*}{ALLY}
9   Workers' groups' stewards initially rising to show agreement (6) UNISON UNI(+s)SON(-s)
16 Energy lost from dodgy rear heater's element (4,5) RARE EARTH {ReAR+HEATER}*
17 'Happy, Sir?' (Man, unfortunately, is furious) (2,2,4) UP IN ARMS {UP}{SIR+MAN}*
19 Second-rate chump has to return prize (3-3) TIN-POT {NIT<=}{POT}
20 Endless acrimony with development for island (7) MINORCA ACRIMONy*
21 Hindu creator's not a creator of music (6) BRAHMS BRAHMaS
23 Following agreement, I'm reversing position (3-2) MID-ON {NOD}{IM}<=

Reference List
River = R, Year = Y, New = N, Pound = L, From = F, Cold = C, Australian =Boy = SON, Sabbath = S, Energy = E