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ACROSS

 1 Naval war hero’s addiction (4,4,5)

 9 Lunatics send a message back, concealing mental instability (7)

10 Force of uranium at the core of simple explosion (7)

11 Doctor ran with aged traitor (8,6)

12 Shaped terrible (C+) conference that’s a source for online talks (8)

14 Move discreetly with bogus opt-in link (6)

17 Engineer had won? Most definitely (3,3)

18 Literary optimist’s pain and bereavement (8)

20 Odd couple embracing Northern French composer (7,7)

24 Tolerate turkey in pouch, with hen’s head… (7)

25 …outside the body’s opening, swallowing six (2,5)

26 Poet’s beer, for adults only—and, um, what you need to complete three other clues in this puzzle (9,4)

DOWN

 1 Jack to referee track event (4)

 2 Where you could invest your money: fringe entertainment in high definition (5,4)

 3 Sung harmony in musical work (5)

 4 Immaculate? That’s a crazy delusion (8)

 5 Connections with cigarettes (6)

 6 Radioactive pink argon means “don’t leave your car here” (2,7)

 7 Volley’s symbol, originally: broken oval (5)

 8 Unnecessary syringes sting at first (8)

12 Sea creature’s shout, superficially like a bark? (8)

13 Strangely corporeal nun (4,5)

15 At heart, metal and wood want to be molded—you might put them together (3,3,3)

16 Imitated Harpo clumsily after the start, and did not get laughs (8)

19 Around Tuesday, unfortunately, Ma has trouble breathing (6)

21 An Italian ode to the capital? That’s fragrant (5)

22 Tool located in front at any time (5)

23 Jab at a pig’s secret location? (4)

SOLUTION TO PUZZLE NO. 3288

ACROSS 1 & 28 pun 7 & 27 ANGLE + E 9 B(A TH/TU)B 10 J + OCULAR 11 LOO + KIN 12 anag.  14 PO(K + ERHA)ND (Hera anag.)  15 FO + LIO (rev.) 16 IRIS + H  18 FAR + AND + OLE 20 anag.  22 anag. 25 PILS + NER (rev.)  26 AC(TED)UP 

DOWN 1 CAB + A + L 2 N(E + TB)OOK 3 PATR (anag.) + IARCH (anag.) 4 CUB + E 5 OB (rev.) + JETS + DART 6 alternate letters 7 pun  8 GYRO (anag.) + S + COPE 13 [s]/W-AFF(LEI)RON 14 “prints a pull”  15 anag. 17 I + N(V)OLVE (novel anag.) 19 anag. 21 anag. 23 AS + PEN  24 hidden