14a: Adamant, I dig frenziedly for the 1544 response on catholic reforms (11) I have ?N?I?I?A??? It seems to be an anagram of "adamant+I+dig". Could it be "anti ...." ?
21a: Canons assembled with, for example, dean's time detailed (7) I have C?A???R
Yes, yes, yes!! That's it!! I thought I'd tried all possible anagrams but I must have missed that one. Never heard of the word before, so thanks so much for your help.