Get off a horse (8)
I believe the answer is:
dismount
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">get off a horse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for dismount that I've seen before include "Get down, from bike or horse" , "Alight from a horse or bicycle" , "Get off one's horse" , "Desert Arab perhaps" , "Get off a horse/bicycle" .)