Brand of gas Tim exploded (6)
I believe the answer is:
stigma
'brand' is the definition.
('stigma' can be a synonym of 'brand')
'gas tim exploded' is the wordplay.
'exploded' is an anagram indicator.
'gas'+'tim'='gastim'
'gastim' is an anagram of 'STIGMA'.
'of' is the link.
(Other definitions for stigma that I've seen before include "Sign of disgrace" , "Symbol of disgrace or infamy" , "Mark of shame or social disgrace" , "Disgraceful mark" , "Mark of shame, stain on reputation" .)