Sycamore, eg (5)
I believe the answer is:
maple
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sycamore eg</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that Acer pseudoplatanus parent taxon maple)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for maple that I've seen before include "----- leaf: symbol of Canada" , "Canadian flag leaf" , "Tree with winged fruits" , "Its leaf is the emblem of 8 down" , "Ample sort of tree" .)