Oily; ingratiating (6)
I believe the answer is:
greasy
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">oily</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that oily can be written as greasy)</span><br/ ><br/ >'<span class="explanation-format__original">ingratiating</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(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" .)