In fact, truly (6)
I believe the answer is:
indeed
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">in fact</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">truly</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for indeed that I've seen before include "Without question" , "''A friend in need is a friend . . . . . .''" , "Really - truly" , "Yes, truthfully" , "In reality" .)