Biggest (7)
I believe the answer is:
largest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">biggest</span>' is the definition.<br/ ><span class="explanation-format__explanation">('large' can be a synonym of 'big')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for largest that I've seen before include "Most ample" , "Chief" , "Superlatively extensive" , "most great" , "Of greatest magnitude" .)