Enlargement, growth (9)
I believe the answer is:
expansion
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">enlargement</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that enlargement can be written as expansion)</span><br/ ><br/ >'<span class="explanation-format__original">growth</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for expansion that I've seen before include "Enlargement" , "Increase in volume" , "increase in capacity" , "Process of increasing in size, volume etc" , "fatter" .)