Tree cover (4)
I believe the answer is:
bark
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tree cover</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bark that I've seen before include "Tree's outer layer" , "Hardly a sound from Tom" , "give sharp cry" , "Dogs might react to this part of a tree" , "Sound from animal < having part of tree" .)