Prince William's mum
I believe the answer is:
diana
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prince william's mum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for diana that I've seen before include "She separated from Charles" , "MONKEY" , "Roman goddess of the moon and hunting" , "Roman equivalent of Artemis" , "Dame - Rigg, actress" .)