Man heard to get water heater (6)
I believe the answer is:
geyser
'water heater' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for geyser that I've seen before include "spouter!" , "Fountain of hot water from natural spring" , "It blows off steam" , "one named Old Faithful" , "wall heater" .)