Start to mature? (3)
I believe the answer is:
pre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">start to mature?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pre that I've seen before include "Prefix meaning before" , "Combining form meaning before" , "Before, prior to" , "Before starting" , "Before or ahead of" .)