Guru Angad keeps backing island republic (5)
I believe the answer is:
nauru
'island republic' is the definition.
(I've seen this before)
'guru angad keeps backing' is the wordplay.
'keeps' indicates a hidden word.
'backing' says the letters should be written in reverse.
'uruan' is hidden within 'guru angad'.
'uruan' back-to-front is 'NAURU'.
(Other definitions for nauru that I've seen before include "Pacific coral island republic, once rich in phosphates" , "little nation" , "Island country in Micronesia" , "Smallest Pacific state" , "Pacific island country" .)