Note military practice removing leader in religious establishment (7)

I believe the answer is:

nunnery

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'religious establishment' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for nunnery that I've seen before include "Hamlet to Ophelia: 'Get thee to a . . . . . . .'" , "sisters' place" , "Female religious house" , "Religious house for females" , "Convent" .)

I've seen this clue in The Telegraph.

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