Strange mania grips one born in this country (7)
I believe the answer is:
namibia
'this country' is the definition.
(Namibia is an example)
'strange mania grips one born' is the wordplay.
'strange' indicates anagramming the letters.
'grips' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'born' becomes 'b'.
'mania' is an anagram of 'namia'.
'i'+'b'='ib'
'namia' placed around 'ib' is 'NAMIBIA'.
'in' acts as a link.
(Other definitions for namibia that I've seen before include "Country in southern Africa" , "Southern African country" , "African republic" , "South African country" , "SW African state" .)