Children's question (5)
I believe the answer is:
issue
This clue is a double definition.
'children's' is the first definition.
(thesaurus)
'question' is the second definition.
(thesaurus)
(Other definitions for issue that I've seen before include "particular edition of magazine?" , "important subject" , "Children; matter" , "Subject for discussion; dish out" , "Emerge" .)