The inlet where the water was hot? (4)
I believe the answer is:
wash
'the inlet where the water' is the definition.
I can't tell whether this definition defines the answer.
'was hot?' is the wordplay.
'hot?' becomes 'h' (abbreviation eg on taps).
'was'+'h'='WASH'
Can you help me to learn more?
(Other definitions for wash that I've seen before include "Clean oneself" , "wake" , "shower" , "bath" , "Perform ablutions" .)