5  OTC given makeover by Washington's old foe (4,4)

 9  Clowns involve family members in birthday ritual (8)

10 Material about company admitting endless deception (6)

11 Paxman may be a poser but he's got all the answers (10)

12 Possibly stole money in Cambodia (4)

13 Taught a lesson in quiet university building (8)

16 John beavered away at finally replacing old copper (6)

17 Getting naked after divinity lesson's vulgar (6)

19 Takes care of young boy's first cavity, tackling it, ... (8)

21 ... not to be distasteful, after a ... (4)

22 ... tricky set of problems in German city loo? (3,2,5)

25 In time traitor will make mistakes (6)

26 Playing around last month in a neighbourly contest lacking bite from the start (8)

27 Traveller was bound to avoid attractive women on first of these trips (8)

28 Warrant officer, trapped by natives, keels over (6)

 2  African's emancipation from guru hushed up (5)

 3  City plaza's being restored (2,3)

 4  Discovered wasp in a Chinese vegetable (7)

 5  Called on challenged nurses to serve (7)

 6  Romeo's caught in bar scrap (7)

 7  Tore muscle in a number of malicious attacks (9)

 8  Tesco not worried about competition - in the end it's a foregone conclusion (2,7)

14 June almost ruined broadcast, but no damage done (9)

15 Setter comes close to pinching a bishop's behind (2,7)

18 Call in teammates from French college (7)

19 Rubbish collectors drop trousers (3-4)

20 To live on picked up birds spreads contamination (7)

23 Run circles round barbecue? (5)

24 Take in exhibit behind Charlie (5)