In rehab, I suspect, in Ireland (8)
I believe the answer is:
hibernia
'ireland' is the definition.
('Hibernia' can be a synonym of 'ireland')
'in rehab i suspect' is the wordplay.
'suspect' indicates an anagram.
'in'+'rehab'+'i'='inrehabi'
'inrehabi' with letters rearranged gives 'HIBERNIA'.
'in' is the link.
(Other definitions for hibernia that I've seen before include "Latin name for Ireland" , "Emerald Isle, historically, poetically" , "Ancient Ireland" , "Poetic name for Ireland, now archaic" , "Old or poetic name for Ireland (8)." .)