Catkin-bearing tree (5)
I believe the answer is:
alder
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">catkin-bearing tree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alder that I've seen before include "One [TYPE OF TREE]" , "Tree related to the birch" , "Artificial fishing fly" , "Tree or shrub whose wood is resistant to underwater rot" , "North temperate tree with cone-like fruit" .)