Crossword Genius

Outrageous drag is coming at the end of March carnival (5,4)

Ross

I believe the answer is:

mardi gras

I'm a little stuck... Click here to teach me more about this clue!

'carnival' is the definition.
(I know that Mardi Gras is a type of carnival)

'outrageous drag is coming at the end of march' is the wordplay.
I cannot really understand how this works, but
'march' could be 'mar' (abbreviation) and 'mar' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for mardi gras that I've seen before include "Shrove Tuesday celebration" , "Day for 9 acrosses" , "Time for carnival" , "Revelry celebrating Shrove Tuesday" , "Carnival (day)" .)

I've seen this clue in The Guardian.
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