Smarmy (8)
'smarmy' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for oily that I've seen before include "Smarmy" , "covered in grease" , "Covered in lubricant" , "Like a lot of fish" , "Greasy - obsequious" .)
'smarmy' is the definition.
(I know that smarmy can be written as unctuous)
This is all the clue.
(Other definitions for unctuous that I've seen before include "Smarmy" , "Excessively flattering" , "Greasy" , "Sycophantic - oily" , "Slimily ingratiating" .)