Baretter, the clues are not all anagrams like 26. You need to think of a word for what you have guessed to be the definition e.g. 9ac, definition = prisons, so, C for cold + a plural word that can mean 23, then replace that with a word for 22 which fits with the crossing words. The original word will not fit with the crossers. Do all the non-theme ones first.
Having said all that I still don't have 13dn!