Idler drifting around an island (7)
I believe the answer is:
ireland
'island' is the definition.
(island nation)
'idler drifting around an' is the wordplay.
'drifting' indicates anagramming the letters.
'around' is an insertion indicator.
'idler' is an anagram of 'ireld'.
'ireld' placed around 'an' is 'IRELAND'.
(Other definitions for ireland that I've seen before include "British composer" , "Country west of Wales" , "EU member country" , "music writer" , "See 10" .)