Uncontrollable oil gush — hot and revolting (8)
I believe the answer is:
Here is my best explanation:
'revolting' is the definition.
'uncontrollable oil gush hot' is the subsidiary indication.
'uncontrollable' is an anagram indicator (I've seen this in other clues).
'hot' becomes 'h'.
'oilgush' with letters rearranged gives 'ghoulis'.
'and' is the link.
(Other definitions for ghoulish that I've seen before include "Macabre", "Morbidly interested in death or disaster", "Morbid, horrible" and "Gruesome".)