Crossword Genius

New church to accommodate singers of Jerusalem, where East meets West? (9)

Ross

I believe the answer is:

greenwich

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But I can't explain it at all! Could you help me understand?

(Other definitions for greenwich that I've seen before include "part of London" , "London suburb associated with Mean Time" , "Zero degrees of longitude runs through the London borough" , "London borough with meridian" , "London borough, site of the Royal Observatory" .)

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