"Naturally" (2,6)
I believe the answer is:
of course
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">naturally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that naturally can be written as of course)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for of course that I've seen before include "Without a doubt, as was to be expected" , "without question" , "Naturally, goes without saying" , "need I say" , "Naturally, as one would expect" .)