Shrove Tuesday carnival (5,4)
I believe the answer is:
mardi gras
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shrove tuesday carnival</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 mardi gras that I've seen before include "Shrove Tuesday festival" , "pre-Lent festival" , "Time for carnival" , "Revelry celebrating Shrove Tuesday" , "Shrove Tuesday carnival" .)