Stop the man overturning focus for prayer in a mosque (6)

I believe the answer is:

mihrab

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'stop' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Another definition for mihrab that I've seen is " Niche in a mosque marking the direction of Mecca".)

I've seen this clue in The Sunday Times and The Times.

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