Crossword Genius

"Tap!", quartet at Harden said (6)

Ross

I believe the answer is:

faucet

'tap' is the definition.
(term for a tap in US English)

I cannot understand how the rest of the clue works.

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

I've seen this clue in the Sydney Morning Herald.
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