Solution to 3D 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.
Open for anyone to answer, if not solved by 1 PM.
ACROSS
1 Say plainly what one thinks of boy stealing top and denims slyly (5,4,4) SPEAK ONES MIND {S{PEAK}ON}{DENIMS*}
8 Vitality in bedroom, phenomenal (5) OOMPH [T]
9 In addition to iodine, uranium found in unusual chemical element (9) RUTHENIUM {THEN}{I}{U} in {RUM}
11 Speculating in article on crypto finally going up (10) THEORISING {THE}{c...tO}{RISING}
12 Roll with bit of cheese and cream (4) COIL {Ch...e}{OIL}
14 Quickly controls anger, being most dispassionate (7) FAIREST {FA{IRE}ST}
16 Vaguely stealthy, consuming ecstasy behind toilet (7) LOOSELY {S{E}LY}<=>{LOO}
17 Policeman's suggestion to catch international head of criminals (7) OFFICER {OFF{I}{Cr...s}ER}
19 Really skilful ball, trapping Australia's opener on hundred (2,5) DE FACTO {DEFT}{0} over {Au...a}{C}
21 A little kid painting small motor-racing vehicle (4) KART {Kid}{ART}
22 Bar-hopped in Peru on vacation and fought outside clubs (3-7) PUB-CRAWLED {PerU}{B{C}RAWLED}
25 Checking lump in body (9) THWARTING {TH{WART}ING}
26 India's top star in retreat getting close to hottie is engaged (2,3) IN USE {In...s}{SUN<=}{h...iE}
27 High-strung European overwhelmed by myalgic problem and high blood sugar in US (13) HYPERGLYCEMIA {HYPER}{GLYC{E}MIA*}
DOWN
2 Show that is about Italy's archaeological site (7) POMPEII {POMP}{IE<=}{I}
3 Hate blunder in retrospect, taken in by rogue on beach (10) A?H?R?E?C? ()
5 Twisted knee after a little tumble in finale (9) ENTANGLED {ANGLE}<=>{Tu...e} in [END}
6 Patient beginning to moan with cry of fright (4) MEEK {Moan}{EEK}
7 Smelly moose in compound (7) NOISOME*
8 Where thief might take wallet, being without money (3,2,6) OUT OF POCKET [DD]
10 Awfully comely doll captivating daughter's baby (11) MOLLYCODDLE {COMELY+DOLL} over {D}
13 Wild animal mauled emir at compound (10) WOLFRAMITE {WOLF}{EMIR+AT}*
15 Distressing nonsense about code-breaker (9) TORTURING {ROT<=}{TURING}
18 Dreamy fellow beginning to attract women in a flash (7) FARAWAY {F} with {At...t}{W} in {A}{RAY}
20 Contact medicos at centre about copper getting kidney stones (7) CALCULI {CAL{CU}L}{medIcos}
24 Real crazy brute killing bishop (4) TRUE bRUTE*
Reference List
Unusual = RUM, Ecstasy = E, Toilet = LOO, International = I, Hundred = C, Clubs = C, European = E, Italy = I, Run out = RO, Daughtr = D, Fellow = F, Women = W, Name = N, Bishop = B