Solution to 5D 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
10 Private joint - one enters (7) SOLDIER {SOLD{1}ER}
11 Time to argue about subversion (7) TREASON {T}{REASON}
12 Barbaric, cruel, hosts providing for the devil (7) LUCIFER {LUC{IF}ER*}
13 Able to jump into a run-down theatre (7) FLEAPIT {F{LEAP}IT}
14 Strangely neutral about extra input - It's the ultimate (2,4,5) NE PLUS ULTRA {NEUTRAL}* over {PLUS}
19 Figure about taking people in Delhi to a German city (7) COLOGNE {CO{LOG}NE}
21 Religious one - here at the centre, he was the first (7) PIONEER {PI}{ONE}{hERe}
23 Said to be different amid all the noise - it's contempt (7) DISDAIN {D{SAID*}IN}
26 Song Of Songs able to make you giggle, they say (8) CANTICLE {CAN}{(~tickle)TICLE}
27 Criminals somewhat received jail sentence (5) TRIAD {T{RI}AD}
DOWN
1 By housing the sick is able to get a water boiler (8) BILLYCAN {B{ILL}Y}{CAN}
3 Yellowish green map, utilize again (10) CHARTREUSE {CHART}{REUSE}
5 Makes sense since a state doubled input (4,2) ?D?S ?P (Addendum - ADDS UP {A{DD}S}{UP} )
6 Lets out but we are caught in a fight (6) TUSSLE {T{US}SLE*}
8 Others follow the first lady to the top of the world (7) EVEREST {REST}<=>{EVE}
13 Rear houses empty from top to bottom bed (4-6) FOUR-POSTER {F{(-p)OUR(+p)P}OSTER}
16 Copy right - it provided a welcome drink (8) APERITIF {APE}{R}{IT}{IF}
17 They're highly reactive like the odd adopted child (5) ACIDS {A{ChIlD}S} Letter pick indicator wrongly placed
18 Starts first in Delhi - internal set up is against congress (6) FRIGID {Fi..t}{In}{De..i} over {RIG}
20 Rascal masquerading as an old sailor (6) LASCAR*
22 Gold coins - where are they in circulation (6) ORBITS {OR BITS}
24 Not all electronic equipment is good (4) NICE [T]
Reference List
Time = T, People in Delhi = LOG, Religious = PI, Right = R, Gold = OR
