Chrise, the first four words of the clue indicate where the answer is found. And tje subsidiary indication is given by the “contribution from Ximenes” before the letter which symbolises 1000, ie the first two letters
Not relevant. An excuse to include the revered name in the puzzle. It could have been any word beginning Xim- or Xik- but that’s the only thematic one. “Contribution from Xim- before 1000” effectively means ignore what comes after the M. You might not like it, but it’s definitely how it works!
Hi BarryC
9 is how a revered compiler in the Observer might introduce himslef.
Difficult to give a hint for 15/16. Clever clue, two ways of including two people
7 is the compiler with a gtruncated teacher, to give a reminder of something