Circus tent (3,3)
I believe the answer is:
big top
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">circus tent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for big top that I've seen before include "needed by Mae West, for one?" , "Circus venue" , "performance in The Ring" , "entertainment centre" , "'Main circus tent (3,3)'" .)