Crossword Genius

Cathedral water suppliers? (5)

Ross

I believe the answer is:

wells

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'cathedral water suppliers?' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

'water suppliers?' is the wordplay.
'water' becomes 'well water' (well water is a kind of water).
'suppliers?' becomes 's' (this could be a standard abbreviation which I don't know about).
'well'+'s'='WELLS'

Can you help me to learn more?

(Other definitions for wells that I've seen before include "Sources of water" , "What a boring person might produce" , "Author" , "Cathedral city; sci-fi writer" , "H. G. . . . . ., science-fiction writer" .)

I've seen this clue in the Evening Standard.
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