Toilet's in shed, I hear (6)
I believe the answer is:
throne
'toilet's' is the definition.
('throne' can be a synonym of 'toilet')
'shed i hear' is the wordplay.
'shed' becomes 'thrown'.
'i hear' shows a homophone (sound like).
'thrown' sounds like 'THRONE'.
'in' is the link.
(Other definitions for throne that I've seen before include "A king or queen sits on it" , "Sovereign's seat" , "Ceremonial seat" , "Seat of monarch" , "Regal seat" .)