Cause to expand (6)
I believe the answer is:
dilate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cause to expand</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 dilate that I've seen before include "Enlarge - detail (anag)" , "Widen, spread out" , "Widen as eyes may" , "Become wider, pupil of the eye perhaps" , "explain more fully" .)