Arp art (4)
I believe the answer is:
dada
'arp art' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dada that I've seen before include "Early C 20 art movement" , "Precursor of surrealism" , "short-lived artistic movement" , "Early 20th-century nihilist arts movement" , "Nihilistic 20th-century European art movement" .)