Crossword Genius

Big celebration (4)

Ross

There are a few possibilities for this:

'big celebration' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for bash that I've seen before include "Party - punch" , "knock" , "Criticise -- social gathering" , "Shindig, function" , "Dent - party" .)

I've seen this clue in The New York Times and the LA Times.
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