11 across
Martin’s
followers
reform
most
of
unearthly
beliefs
ultimately
(9)
Martin’s followers reform most of unearthly beliefs ultimately (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Martin's followers — that's your definition, pointing you to followers of Martin Luther. For the wordplay, "reform" is your anagram indicator, and the fodder is built from two bits: most of unearthly gives you UNEARTH L (drop the last two letters, LY, from UNEARTHLY), then beliefs ultimately chips in the final letter of "beliefs", which is S. Scramble UNEARTHL and S together and you've got your nine-letter answer.