Liverpool racecourse (7)
I believe the answer is:
aintree
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">liverpool racecourse</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 aintree that I've seen before include "Trainee in Grand National venue" , "Liverpool racecourse" , "place for horse racing" , "Merseyside racecourse" , "Here they run" .)