Make broader (5)
I believe the answer is:
widen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make broader</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for widen that I've seen before include "Add" , "Make less narrow" , "Spread" , "Broaden - enlarge" , "Dilate" .)