5  Head of government, touring, has employed worker for illusion (8)

 9  Ruler, with one hesitation after another, leaves shopping centre (8)

10 Force first military exercises in mountain pass (6)

11 Ruffled my hair, deep in online video links, say (10)

12 Go off entertaining Master of Ceremony (4)

13 Mr eats up battered and deep fried dishes (8)

16 Initial publisher a long way back after reading first few pages? (6)

17 Confusing situations when Jagger drinks to the audience (3-3)

19 Start to drive after power unit spoiled (8)

21 Do, perhaps, or don't keep head of some kind of whale (4)

22 Pastrami scattered around one's flukey lifestyle, maybe? (10)

25 I'm initially procuring evidence documenting extrajudicial delay (6)

26 "Work that thing!" Retired mother's most favourable conditions (8)

27 Record setback with accidental format of operating system? (8)

28 Cause for leaders of mass protest today (6)

 2  Irregular, uneven, loud and mopey (5)

 3  Gloomy opening sheltering one with poor eyesight, perhaps (5)

 4  Overly formal man clothed in first coat (7)

 5  Sad poem about hair products (7)

 6  Roofless car with immobilisation device has electric light (3,4)

 7  Watch pet mice playing around, that is to say (9)

 8  Morning defeat breaking small support line carrying heat in NYC? (5,4)

14 Energetic head massage primed a first layer of the skin (9)

15 Fruit maidens ate regularly is most desirable (9)

18 Some newcomer pushed around by boss (7)

19 Carry out work, barely, after agricultural labourer demands "STOP!" in front of master (7)

20 Rising trumpets simply cover up blunder (7)

23 Choose to restrict setter's elevated rate (5)

24 Add clue for greek characters? (3-2)