Look after children (4-3)
'look after children' is the definition.
This is all the clue.
(Other definitions for babysit that I've seen before include "Tend to kid" , "Take charge to allow parents to go out" , "Mind" , "Look after children temporarily" , "Supervise in loco parentis" .)
'look after children' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for baby-sit that I've seen before include "Mind small children while parents have a night out" , "Look after a young child" , "Relieve parents" , "Look after youngsters" , "Tend" .)