Oily; ingratiating (6)
I believe the answer is:
greasy
I believe this is a double definition.
'oily' is the first definition.
(I know that oily can be written as greasy)
'ingratiating' is the second definition.
(I've seen this before)
(Other definitions for greasy that I've seen before include "Cheap 24" , "Thickly oleaginous" , "well-lubricated" , "sort of spoon" , "Oily in manner, covered with lubricant" .)