Insecure Sudan yet to reform (8)
I believe the answer is:
unsteady
'insecure' is the definition.
(thesaurus)
'sudan yet to reform' is the wordplay.
'to reform' is an anagram indicator.
'sudan'+'yet'='sudanyet'
'sudanyet' anagrammed gives 'UNSTEADY'.
(Other definitions for unsteady that I've seen before include "Subject to change or variation" , "Insecurely positioned" , "Wavering" , "Not safe" , "Unstable" .)