Absurdist art movement (4)
I believe the answer is:
dada
'absurdist art movement' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dada that I've seen before include "Art movement; father" , "Early 20th-century avant-garde art movement" , "movement in art and literature" , "Early 20th-century arts movement, emphasizing the absurd" , "Post-WWI anarchic movement" .)