1 Letter sequence in an old joke, one that concludes with “I’m a frayed knot” (9,6)

 9 A spot in part of the garden stayed dry (9)

10 Recall to go over old compact car (5)

11 Explode supersonic cover for toy gun ammunition (10,3)

14 Trash cores in a heap—their sections are in this puzzle (10)

17 20 naked tramps (4)

19 They’re slippery parts of ‘enry ‘iggins’ shoes (4)

20 For instance, fiddle with piece of equipment (10)

22 Generals and I touched down with Barry, unfortunately, in a mob (8,5)

26 Delivered hotel’s legal documents (5)

27 Stars in island entertainment that is shmaltzy (9)

29 Movie’s family rating which can’t be removed from the reel? (4,4,3,4)
 

 1 Abandoned mine cop had fought for (10)

 2 Norse gods originally advise, “Get up! Get up!” (5)

 3 Group of lawyers with 100 applications for digital calculators (8)

 4 and 28 Main objection raised is petty (3-3)

5  Egyptian and Italian gods communicate through the air (5)

 6 Headings to photographs (6)

 7 Powerless, in telegram, to protect father (9)

 8 Hoagy (40%), hero (50%)… in the end, it’s just a sandwich (4)

12 Demonstrated a fabric (5)

13 Discarded plane even conceals boy (10)

15 Criminal: “I’m cool—ban Gabriel García Márquez, say” (9)

16 Change seen in neutral territory (5)

18 ”Where to Recycle a Dog”: a song not likely to hit the charts (8)

21 It may no longer cut a chestnut (3,3)

23 Implied attic is a mess (5)

24 Dressing the fronts of armoires in old lingerie items (5)

25 Grasp and shoot (4)

28 See 4
 

ACROSS 1 pun 8 2 defs. 9 ADHE + RENT (head anag.) 11 OV(ERR)ID + E 12 NE(UR)ON 14 “Harry” 15 P(HEN + OMEN)A 17 ST(EEL + D)RUM 19 RAP ID 20 “claws” 22 S + CISSORS (Cross is anag.) 24 “wring tale” 25 anag. 26 2 defs.
 
DOWN 1 AS + TROPHY + SICS 2 T(ANGER)IN + E 3 S(WE)ARBY[’s] 4 G + RAN + DOPER + A 5 hidden 6 anag. 7 hidden 10 INCAN + DESCENT 13 V(ERM)I + CELLI (R.E.M. anag.) 16 EX-P + LOSIVE (olives anag.) 18 LA SAG(N)A 19 REST + ART 21 ALI + BI 23 YAW + P (way rev.)