Ornamental tree (4)
I believe the answer is:
acer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ornamental tree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for acer that I've seen before include "Plant" , "Tree of maple family" , "Care about this tree" , "Tree or shrub of the maple genus" , "Care about the maple?" .)