Make as large as possible (8)
I believe the answer is:
maximise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make as large as possible</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 maximise that I've seen before include "Make the best use of" , "Make as large as possible" , "Make as big as possible" .)