Exceptionally large (7)
I believe the answer is:
massive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exceptionally large</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 massive that I've seen before include "Not wavering" , "Gargantuan" , "Great" , "Monolithic, huge" , "Exceptionally large" .)