Faucets (4)
I believe the answer is:
taps
'faucets' is the definition.
(tap is a kind of faucet)
This is the entire clue.
(Other definitions for taps that I've seen before include "The sound of lights out" , "Bugs; valves" , "Strikes lightly; eavesdropping devices" , "Military signal to turn the lights out" , "They're faucets in America" .)