Actually; very (6)
I believe the answer is:
really
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">actually</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that actually can be written as really)</span><br/ ><br/ >'<span class="explanation-format__original">very</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that very can be written as really)</span><br/ ><br/ ></span>
(Other definitions for really that I've seen before include "surely not?" , "Do you mean it?" , "Dead" , "without a doubt" , "Undoubtedly" .)