Baby's first word, perhaps (4)
I believe the answer is:
dada
'baby's first word perhaps' 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 "short-lived artistic movement" , "Nihilistic 20th-century European art movement" , "Man Ray's art movement" , "Irreverent Twentieth Century art movement" , "Post-WWI anarchic movement" .)