Sorry folks, I started this morning's crossword well but now I am on the crest of a slump.
13a. Wealthy ruler to put Carl out. 9
(The only 9 letter rulers I can find are potentate and sovereign and these don't make sense)
13d. Greek character overdue with catalogue for collector. 11 ????a??????
25a. Where Jack is at the centre of things. 9
A???????s third letter may be c.
Diolch - Thanks.