Be there (6)
I believe the answer is:
attend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be there</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 attend that I've seen before include "Pay heed" , "Show up" , "Frequent" , "Be there ? pay attention" , "Be present at, or accompany" .)