Pop art? (4)

I believe the answer is:

dada

I believe this is a double definition.

'pop' is the first definition.
(synonyms)

'art?' is the second definition.

(Other definitions for dada that I've seen before include "modern artistic movement" , "Precursor of surrealism" , "Pop" , "Irreverent Twentieth Century art movement" , "Nihilistic 20th-century European art movement" .)

I've seen this clue in The Independent.

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