Come into flower (7)
I believe the answer is:
blossom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">come into flower</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for blossom that I've seen before include "Mature promisingly" , "Come into flower" , "Flowers on tree or bush" , "Flowers (on tree, shrub)" , "Girl - flower(s)" .)