A question for children (5)
I believe the answer is:
issue
I believe this clue is a double definition.
'a question' is the first definition.
(both can mean a matter or problem)
'children' is the second definition.
(issue can mean someone's offspring)
'for' is the link.
(Other definitions for issue that I've seen before include "Edition of a publication" , "Bone of contention" , "outlet" , "Regular publication" , "hot potato?" .)