Island child getting about (7)
I believe the answer is:
minorca
'island' is the definition.
(I've seen this before)
'child getting about' is the wordplay.
'child' becomes 'minor' ('minor' can be a synonym of 'child').
'getting' means one lot of letters go next to another.
'about' becomes 'ca' (abbreviation for 'circa'**).
'minor'+'ca'='MINORCA'
(Other definitions for minorca that I've seen before include "One of Balearic islands" , "Mediterranean island" , "Balearic island; O, cram in (anag.)" , "Land in Balearics" , "holiday island" .)