7  See 28

 9  Lifts bathroom tiles on vacation (5)

10 When broken lid removed, revolutionary let pupil dig a mass grave (6,3)

11 Argumentative type backtracks with confusion and anger at heart, putting it another way (9)

12 Following heads of holy alliance, good man goes on last crusade expedition (5)

13 Broadcast cruel TV channel (7)

15 Phone charger in glove compartment (4)

18 Benjamin Hall's mostly hollow tower oversight? (4)

20 Glow red with a princess and goddess (7)

23 Carp on about cleaning house, primarily following resistance (5)

24 Bird in favour of tasteless clothes makes a fair exchange (3,3,3)

26 Taking potassium solution to block old thrombus (5,4)

27 Awkward priest, penitent, partly retired (5)

28/7       No good, mysterious singers? (6)

29 With military dictatorship leaders ousted, I warn Mr Mladic about Mr Milosevic, maybe (3,8)

 1  Motor's outsiders overtaking evil professional wheel-driver (8)

 2  Resolve to decrease weight by fifty pounds, after lunchtime (4,4)

 3  Bully gives up, close to absolute stunner (5)

 4  Agent almost gutlessly framing in cover-up (7)

 5  Small bet collecting, finally gaining confidence (7)

 6  Made coarse remarks at first, before enough correcting by journalist (9)

 7  Subject of historical significance initially penned by poet (6)

 8  I, for one, trust bankers to invest in church before starting to renovate (6)

14 Watches naked fellow put on feathers, mostly cosmetic (9)

16 Rest up, on the ball, beginning to negotiate with the gods (8)

17 Incomplete support returning on the wagon, maybe (8)

19 Refuse to admit length is shorter (7)

20 Spinner of endless story, over and over, entertaining article (7)

21 Checks and plaids covering dressing gown (6)

22 Fog from the south essentially disrupts proper travel (6)

25 Work with fronts for international undercover mission's sleeper agent (5)