It supplies Americans with water (6)

I believe the answer is:

faucet

'it supplies americans with water' is the definition.
(US term for a tap)

This is all the clue.

(Other definitions for faucet that I've seen before include "One may turn on this" , "North American tap" , "Tap (US)" , "Spigot, tap" , "Pipe" .)

I've seen this clue in The Guardian.

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