Heater that's bizarre being repaired (7)
I believe the answer is:
brazier
'heater' is the definition.
(I know that brazier is a type of heater)
'bizarre being repaired' is the wordplay.
'being repaired' indicates anagramming the letters.
'bizarre' anagrammed gives 'BRAZIER'.
'that's' is the link.
(Other definitions for brazier that I've seen before include "Coal-fire pan" , "heat-source" , "Metal-worker" , "Metal container for burning coal or charcoal; warms the watchman" , "Bizarre (anag)" .)