To a moderate extent (8)
I believe the answer is:
somewhat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to a moderate extent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for somewhat that I've seen before include "To a certain extent" , "Rather, a little" , "To a moderate extent" , "To some degree, sort of" , "Partially, to a degree" .)