Tap and wrench the thing, they say (6)
I believe the answer is:
faucet
'tap' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for faucet that I've seen before include "Pipe" , "One may turn on this" , "Tap (US)" , "Spigot, tap" , "North American tap" .)