Little personal responsibility (4)
I believe the answer is:
baby
I believe this is a double definition.
'little' is the first definition.
(thesaurus)
'personal responsibility' is the second definition.
(as in a pet project)
(Other definitions for baby that I've seen before include "Pamper; childish person" , "-- Oil; -- boom" , "needing dummy?" , "This 13 [SPICE]" , "Very young child" .)