7  Without hesitation, lose concentration and stick with 13  (4)

 8  13 heard obscenities from prostitute and writer  (5-5)

10 Place to view performance, 13 perhaps  (6)

11 Male aliens with 13 balls  (7)

12 It could make mass vibrate, literally  (8)

14 13 turn  (5)

16 Smoke pipe, a 13 pipe but not a whiff of tobacco  (4)

17 Have a go regularly with one’s sponsorship  (5)

18 Fresh produce  (4)

19 13 to favour sinister parts  (5)

21 Constituents of schemes with knight  (8)

23 Shakes with 13 song  (7)

25 John travelled North East  (6)

26 13 10?  (10)

27 Ground Zero, not quite goodbye  (4)

 2  Bad clue re-written by me, finally could make the grade  (8)

 3  Mad Hatter or crazy Hare after start to Tea Time hazard  (6)

 4  One refusing to stop earning a crust  (4)

 5  Spoil transplant on top of sibling’s hair loss  (8)

 6  Wiped underneath step stool originally one used as doormat  (4)

 9  It needs to be seat’s stuffing to get well-upholstered  (5)

13 It’s fab having smart threesome about  (5)

15 Chat under 13 light, provides cause of gaunt appearance  (7,3)

17 A river and a state  (8)

18 Grow larger, like Alice if 13?  (8)

20 Group named Saatchi & Saatchi?  (5)

22 Attempt to get sex for right body  (6)

23 Who’s Keith?  (4)

24 Broadcast as Henry Cooper put in an appearance  (4)