How do I solve 15 down in Times Cryptic 29550?

Question

Accepted Answer

15 down reads "Irish can’t reform Catholic?" (9 letters); the answer is CHRISTIAN. It's an anagram clue: the answer is a rearrangement of letters supplied by the clue itself. Look for an indicator like 'mixed', 'broken', 'cooked', or 'wild', and find a phrase whose letters add up to the answer's length. The full step-by-step breakdown is on this page.

Irish can’t reform Catholic? (9)

15D — Irish can’t reform Catholic? (9) — CHRISTIAN