Matures (4)
I believe the answer is:
ages
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">matures</span>' is the definition.<br/ ><span class="explanation-format__explanation">('age' can be a synonym of 'mature')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ages that I've seen before include "Donkey's years" , "Historical eras" , "Awfully long time" , "Matures" , "Times" .)