Yellowstone sight (3)
I believe the answer is:
elk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yellowstone sight</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 elk that I've seen before include "Type of moose" , "Large deer of N Europe and Asia" , "Big beast" , "European moose" , "Large northern deer" .)