Flattery, blarney (4,4)
I believe the answer is:
soft soap
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">flattery</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(soft soap is a kind of flattery)</span><br/ ><br/ >'<span class="explanation-format__original">blarney</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that soft-soap is a more specific form of the action blarney)</span><br/ ><br/ ></span>
(Other definitions for soft soap that I've seen before include "Use flattery on (someone)" , "(Use) flattering talk" , "Flannel" , "Flattering talk from tender cleanser?" , "Flattery of cleansing kind?" .)