9  Predict isotope decays - exactly the reverse (6,8)

10 Fall following cut (4)

11 Donations changing hands for insignia (4)

12 Selection of prime numbers (4)

15 Poet's university in Yemeni city (5)

16 Chemical engineer welcomes Bill into store (5)

17 Brief solicitor's note (3)

18 Dance around with fellow (3)

20 Northern French friend hides love for mother-in-law? (5)

21 Endlessly evaluating toxic chemical (5)

23 Letter to the Corinthians from India back to Austria (4)

24 Maybe Jon leaves wife for good kiss (4)

25 Type of film I run after Japanese drama (4)

27 Side's infectious description of rebel leader (4-10)

29 Gnawing grief's grotesque and good (6-7)

 2  Institute turned king away showing evidence of cold? (7)

 3  Private detective's opportunity (3-7)

 4  Booth's put the lid on dismissing leader (3)

 5  Wanting to include naughty imps (3-8)

 6  Vow to squash Latin heroine (4)

 7  German son hides hat in planes (7)

 8  Note about old game (3-7)

11 Compere's to take care of billiards shot (6,5)

13 Swedish can cook food (10)

14 Henry's wrong to control porpoise (7,3)

19 Rather dull side returns around the end of March (3,4)

22 Note about article on Italy's wine (7)

26 A fault in part of the Hindu calendar (4)

28 Old soldiers with a shooter (3)