Shoot native touring island group (5)
I believe the answer is:
scion
'shoot' is the definition.
(both can mean a descendant of a family)
'native touring island group' is the wordplay.
'native' becomes 'son' (a 'son' of a particular place is a native of it).
'touring' means one lot of letters goes inside another (tour can mean to go around).
'island group' becomes 'ci' (I've seen this in other clues).
'son' enclosing 'ci' is 'SCION'.
(Other definitions for scion that I've seen before include "Young shoot/twig" , "Plant shoot; descendant of a noble family;" , "Younger member of a family" , "one of a long line" , "Young shoot or twig" .)