‘10/30’ (4,1,4,3,2,4) is the first line of a song whose tune, originally called ‘1D’ (6,2,1,5), was composed by a future 40D/2 and was often played by 39/6. The song’s title explains 34. The composer’s surname will appear diagonally in the completed grid and must be shaded.

        Across

   1    City in Israel bloke traverses (5)

   7    Mate inside once stole jelly (6)

12    Purgative rice pariah concocted (5-5)

14    Perhaps Daphne ruled wearing crown (9)

16    Danced tango with Pole (4)

17    Fish connect mentally (7)

18    Languishing Welshman cried continuously (3-4)

19    Short rope secures sail (3)

20    Wiseacre stops career criminal (7)

22    Veteran acquired gun (3)

23   ...