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
Martin's followers refers to the followers of Martin Luther. Take "unearthly" without its last letter to give UNEARTHL, then add the last letter (ultimately) of "beliefs", which is S; "reform" signals an anagram of UNEARTHL plus S to produce LUTHERANS.