Carriage for baby (4)
I believe the answer is:
pram
'carriage for baby' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pram that I've seen before include "Baby vehicle" , "Baby's carriage" , "Nanny may use this" , "A common baby carriage" , "Ramp for a baby buggy" .)