Children's edition (5)
I believe the answer is:
issue
I believe this is a double definition.
'children's' is the first definition.
(issue can mean someone's offspring)
'edition' is the second definition.
(eg edition of a magazine)
(Other definitions for issue that I've seen before include "Matter, point" , "Matter of contention" , "Send out or distribute for use" , "Matter for discussion" , "One of a series published periodically" .)