Grand National course (7)
I believe the answer is:
aintree
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grand national course</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 "National racecourse" , "Home of the Grand National" , "Grand National course" , "Here they run" , "6 National course" .)