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Some
Mormons
ignore
Catholic
dignitary
(9)
Some Mormons ignore Catholic dignitary (9)
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The definition is at the end of the clue.
How the clue works
See Catholic dignitary at the end — that's your definition, and a monsignor fits the bill nicely. The trick is that "Some" is telling you to dig inside the words "Mormons ignore", and there sitting hidden across those two words is mor-MONSIGNOR-e.