Infant's father (4)
I believe the answer is:
dada
'infant's father' 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 "Man Ray's art movement" , "form of art" , "artistic trend" , "Early 20th-century avant-garde art movement" , "short-lived artistic movement" .)