Dense mass of trees or shrubs (7)
I believe the answer is:
thicket
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dense mass of trees</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">shrubs</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I have seen 'dense shrubs' mean 'thicket' so perhaps 'shrubs' could also mean 'thicket')</span><br/ ><br/ ></span>
(Other definitions for thicket that I've seen before include "Mass of shrubs and small trees growing close together" , "Dense bushy area" , "Copse" , "Dense group of trees or bushes" , "dense vegetation" .)