To mature (5)
I believe the answer is:
ripen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to mature</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to ripen is to mature)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ripen that I've seen before include "Grow to maturity like fruit" , "Get ready for 2" , "Become ready to eat" , "Become ready to pick" , "Become ready for harvesting" .)