Vole relative (7)
I believe the answer is:
lemming
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vole relative</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 lemming that I've seen before include "Rodent that follows others headlong over a cliff" , "Supposedly suicidal animal" , "Rodent related to the vole" , "Rodent renowned for mass migration" , "One misjudges landing" .)