5  Elaborate, no longer simple (7)

 9  Unsure, I fit certain component backwards, a diode perhaps? (9)

10 Carry around a good red pen (5)

11 Slyly break a trapeze - Aussie goes flying? (5,8)

13 Missiles shot inside temporary shelters (8)

15 Output from sewer starts to stink terribly and it makes you scratch (6)

17 Heavy attack after end of shelling claims five (6)

19 Ride in a Roller? Preposterous... (buys Ford) (8)

22 He gets benefit, pocketing entire global float (6,7)

25 No score for musicians (5)

26 Used to be pretty without being absolutely gorgeous (9)

27 Most sophisticated American rejected a singlet (7)

28 Left embraced by even Vice President of Russia (7)

 1  Talk tediously of instrument (4)

 2  Absorbed in music, one succumbs in the centre of hot tub (7)

 3  Rise in chapter and branch (5)

 4  Ignore workers to make clothing for moguls (3,5)

 5  Each river to increase muck in canal (6)

 6  Welcoming paradise at last, infidel shot in elaborate ceremony (9)

 7  I ran amok with mental illness (7)

 8  Employees in the dark about close of plant, impending relocation (5,5)

12 Coach gives support to players (5,5)

14 Polite behaviour and extraordinary quiet between back-to-back films (9)

16 Coolly demolished question included for formal discussion (8)

18 Wanton harlot lay back regularly in US city (7)

20 Takes out tack, for instance bread roll and escargots, though no starters (7)

21 Wretched sailor caught in stream (6)

23 Oxford college that is replacing answer in exam (5)

24 Pale swallowing drug, try to break habit (4)