Complaint about AC/DC, back in Ireland (8)
I believe the answer is:
hibernia
'ireland' is the definition.
(I know that ireland can be written as Hibernia)
'complaint about acdc back' is the wordplay.
'complaint' becomes 'hernia' (hernia is a kind of health problem).
'about' indicates putting letters inside.
'acdc' becomes 'bi' (AC/DC can informally mean bisexual).
'back' is a reversal indicator.
'bi' in reverse letter order is 'ib'.
'hernia' placed around 'ib' is 'HIBERNIA'.
'in' is the link.
(Other definitions for hibernia that I've seen before include "Latin name for Ireland" , "Old or poetic name for Ireland (8)." , "Poetic name for Ireland, now archaic" , "Ancient Ireland" , "Emerald Isle, historically, poetically" .)