Water-heater supplied by bloke’s sound? (6)
I believe the answer is:
geyser
'water-heater' is the definition.
(hot spring that boils water)
'bloke's sound?' is the wordplay.
'bloke' becomes 'geezer' (synonyms).
'sound?' indicates a 'sounds like' (homophone) clue (I've seen 'sounding' mean this).
'geezer' is a homophone of 'GEYSER'.
'supplied by' acts as a link.
(Other definitions for geyser that I've seen before include "Fountain of hot water from natural spring" , "Gas-fired water heater" , "It blows off steam" , "Spring spouting steam and hot water" , "wall heater" .)