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ACROSS

 1 Swimsuit escape: Einstein thought about it a lot (5,2,5)

 9 If Julius Caesar said this word, point outside (9)

10 -26, somehow (5)

11 Alcohol as an alternative in dish (5)

12 Will state absurd theories, initially about guys (9)

13 Workers lacking leadership for billions of years (4)

14 Tangled tale: “Across and Down: ways to get there” (10)

18 Endangered, agitated teen interrupts online conversation (10)

20 Say no to donut, following doctor (4)

23 Lawman’s modernist tendency in poetry? (5,4)

25 Hesitation at lingerie’s shade (5)

26 10 altered briefly (2,3)

27 Courteous jockeys buy overseas, perhaps (9)

28 Spies extinct bird after holiday in Pacific islands (7,5)

DOWN

 2 Rustic, pastoral deity embracing humble mass (7)

 3 Regime changes for expat (6)

 4 Poet: “God is the connection” (5)

 5 To make the rules, member misses the beginning (9)

 6 Dangerous wave of gray engulfing most of a Middle Eastern capital (5,3)

 7 Well-behaved child is into fruit (7)

 8 Wasps sting bears, yo (4)

 9 Hundredth PC: “Enter” breaking down (7)

15 Jobs at the bottom of the scale for a longshoreman (9)

16 Present outside operating room—in closet, maybe (7)

17 Diversions from Pennsylvania’s halfback holding tight end (8)

19 Rise unsteadily and beg to publish again (7)

21 Seize me from below with one type of blood blockage (7)

22 Soft drink consumed, high in a rooftop structure (6)

23 Upset to be like 24 (4)

24 Old Nick took a chair on the outskirts of Austin (5)

SOLUTION TO PUZZLE NO. 3319

 

1 anag. 3 FI(O)REL + LO (flier anag.) 9 UPBR (anag.) + AID
 10 CO(NTAC)T (can’t anag.) 12 hidden
 13 G(UESSWOR)K (us swore anag.)
 15 PA + SSION (anag.) 16 RA IS IN
 19 K + ISMET (anag.) 21 anag. (&lit.) 
24 anag. 26 [l]/R-ENT 28 TIT + ANIC (anag.) 29 CH(ANNE)L
 30 APPL(A + US)E 31 2 defs

DOWN 1 2 defs. 2 TAB + BI[t]ES
4 INDI[e] + GENT 5 2 defs. 6 LO(N)GS 7 OR + ATORS (anag.) 8 VASE LINE 11 T(A + KEN)OTE 14 2 defs. 
17 ARBO (anag.) + REAL 18 S(CI)ENCES (scenes anag.) 20 anag. 
22 RANI + NTO (anag.) 23 GAR (rev.)
+ CIA 25 SU + NUP (rev.) 27 S(L)AY