Fatty acid
There are a few possibilities for this:
'fatty acid' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oleic that I've seen before include "Sort of acid" , "of a deposit?" , "A fatty acid, -- acid" .)
'fatty acid' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lipid that I've seen before include "Oil, say" , "oily substance" , "fatty stuff" , "fat, perhaps" , "Organic compound" .)
(Another definition for trans that I've seen is " Across (prefix)".)