Ensign concerned with touring island group (7)
I believe the answer is:
ancient
'ensign' is the definition.
(both can mean a flag)
'concerned with touring island group' is the wordplay.
'concerned with' becomes 'anent' (Scottish term meaning 'about').
'touring' is an insertion indicator (touring can mean going round).
'island group' becomes 'ci' (I've seen this in other clues).
'anent' placed around 'ci' is 'ANCIENT'.
(Other definitions for ancient that I've seen before include "Pistol" , "Dating from long ago" , "Old salt in Coleridge's poem" , "From the distant past" , "Very old, like some civilizations" .)