Jockey’s mount (5)
I believe the answer is:
horse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jockey's mount</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 horse that I've seen before include "it can become addictive" , "Shore (anag)" , "Vaulting --; -- sense" , "punch, perhaps" , "Domesticated animal" .)