Subarctic forests (5)
I believe the answer is:
taiga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">subarctic forests</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 taiga that I've seen before include "northern forest" , "Boggy forest" , "Swampy Siberian forest" , "Northern region" , "tree-covered region" .)