Meditate moodily upon children (5)
I believe the answer is:
brood
I believe this is a double definition.
'meditate moodily' is the first definition.
(I've seen this before)
'children' is the second definition.
(thesaurus)
'upon' acts as a link.
(Other definitions for brood that I've seen before include "Sulk; incubate" , "Think anxiously for some time" , "Family of young birds" , "Think resentfully about family of children?" , "Meditate moodily" .)