Worry about the children (5)
I believe the answer is:
brood
I believe this is a double definition.
'worry' is the first definition.
('brood' can be a synonym of 'worry')
'the children' is the second definition.
(thesaurus)
'about' is the link.
(Other definitions for brood that I've seen before include "Family of young birds" , "Collection of chickens" , "Ponder - family" , "Hatch" , "Offspring" .)