Old politician briefly accepting current state (7)
I believe the answer is:
liberia
'state' is the definition.
(country in Africa)
'old politician briefly accepting current' is the wordplay.
'old politician' becomes 'Liberal' (the Liberal Party was a UK party until 1988).
'briefly' means to remove the last letter.
'accepting' is an insertion indicator.
'current' becomes 'I' (symbol for electric current).
'liberal' with its final letter removed is 'libera'.
'libera' enclosing 'i' is 'LIBERIA'.
(Other definitions for liberia that I've seen before include "African country, established by the US in 1822" , "W African Republic" , "African republic, capital Monrovia" , "NW African Republic" , "W. African nation" .)