Masses heard in French cathedral city (6)

I believe the answer is:

rheims

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'french cathedral city' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rheims that I've seen before include "French town" , "The Jackdaw of - (The Ingoldsby Legends)" , "Where most French coronations took place" , "The Jackdaw of -- (Barham)" , "French coronation city" .)

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