Fanatic from Zimbabwe’s outside often (6)
I believe the answer is:
zealot
'fanatic' is the definition.
(both can mean an extremist)
'zimbabwe's outside often' is the wordplay.
'outside' suggests removing the centre.
'often' becomes 'a lot' (doing something often is doing it a lot).
'zimbabwe' with its centre removed is 'ze'.
'ze'+'alot'='ZEALOT'
'from' is the link.
(Other definitions for zealot that I've seen before include "A fanatic or over-enthusiastic person" , "Fanatic, obsessed person" , "A fanatic, driven person" , "Person full of enthusiasm, a fanatic" , "Single-minded supporter of a cause" .)