Sort of cured with a kind of oil (5)
I believe the answer is:
crude
'kind of oil' is the definition.
'sort of cured' is the wordplay.
'sort of' is an anagram indicator.
'cured' with letters rearranged gives 'CRUDE'.
'with a' acts as a link.
(Other definitions for crude that I've seen before include "foul-mouthed?" , "Not refined, like oil" , "Not refined, oil say" , "Uncouth" , "Coarse and unrefined" .)