Development (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">development</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that growth is a type of development)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for growth that I've seen before include "Gradual increase" , "Process of development" , "Process of enlargement" , "Increase - development - tumour" , "Tumour - enlargement" .)