Susan Island previously for children (5)
I believe the answer is:
issue
'for children' is the definition.
(issue can mean someone's offspring)
'susan island previously' is the wordplay.
'susan' becomes 'sue' (short for Susan).
'island' becomes 'is' (abbreviation).
'previously' means one lot of letters go next to another.
'sue' put after 'is' is 'ISSUE'.
(Other definitions for issue that I've seen before include "hot potato?" , "Number (of periodical)" , "Emerge" , "Subject to discuss" , "Susie (anag.)" .)