Large northern deer (5)
I believe the answer is:
moose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large northern deer</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 moose that I've seen before include "Large northern deer" , "North American elk" , "beasts" , "Large N American deer like European elk" , "North American deer" .)