Russian wolfhound (6)
I believe the answer is:
borzoi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian wolfhound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(borzoi is a breed of dog)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for borzoi that I've seen before include "Russian hound" , "Russian dog bred for hunting wolves" , "Russian wolfhound" , "Dog like a huge greyhound" , "Zoo rib (anag)" .)