Deny or refuse to acknowledge (8)
I believe the answer is:
disclaim
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">deny</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that disclaim is a more specific form of deny)</span><br/ ><br/ >'<span class="explanation-format__original">refuse to acknowledge</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for disclaim that I've seen before include "Deny, refuse to acknowledge" , "Forswear" , "Renounce" , "Disown or deny, maybe responsibility" , "Deny or relinquish" .)