Maturing (5)
I believe the answer is:
aging
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">maturing</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 aging that I've seen before include "Getting older" , "Getting old" , "Growing older" , "development" , "Maturing" .)