Frying liquid (3)
I believe the answer is:
oil
'frying liquid' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oil that I've seen before include "Anoint" , "Viscous substance for lubrication" , "eg Olive" , "Thick liquid that doesn't dissolve in water" , "Lubricant or petroleum" .)