Derby venue (5)
I believe the answer is:
epsom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">derby venue</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for epsom that I've seen before include "& 5 Purgative medicine" , "Poems about English racing venue" , "place for racing" , "English town, of course?" , "Surrey race course" .)