Country's guru backed university forever (7)
I believe the answer is:
uruguay
'country's' is the definition.
(Uruguay is an example)
'guru backed university forever' is the wordplay.
'backed' says the letters should be written backwards.
'university' becomes 'U' (abbreviation for university).
'forever' becomes 'ay' (historic term for 'forever').
'guru' written backwards gives 'urug'.
'urug'+'u'+'ay'='URUGUAY'
(Other definitions for uruguay that I've seen before include "Montevideo's country" , "South American Republic" , "foreign country" , "S American country, capital Montevideo" , "S. American nation" .)