Engineers text covering one cathedral (5)

I believe the answer is:

reims

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'cathedral' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

'engineers text covering one' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'text' becomes 'MS' (short for manuscript).
'covering' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
're'+'ms'='rems'
'rems' going around 'i' is 'REIMS'.

Can you help me to learn more?

(Other definitions for reims that I've seen before include "City, the traditional site for crowning French kings" , "Champagne capital (variant spelling)" , "City of northeast France" , "city in NE France" .)

I've seen this clue in The Times.

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