City water supplies? (5)
I believe the answer is:
wells
This clue might be a double definition.
'city' is the first definition.
(I've seen this before)
'water supplies?' is the second definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I don't see?
Can you help me to learn more?
(Other definitions for wells that I've seen before include "Springs" , "Cathedral city; sci-fi writer" , "What a boring person might produce" , "Author" , "Oil sources" .)