Country upset about nothing in this part of the world (6)
I believe the answer is:
region
'part of the world' is the definition.
'region' can be an answer for 'part' (region is a kind of part). I am not sure about the 'of the world' bit.
'country upset about nothing in' is the wordplay.
'country' becomes 'Niger' (African country).
'upset' is a reversal indicator.
'about nothing' becomes 'o' (looks like zero - 0. I am not sure about the 'about' bit.).
'in' indicates putting letters inside.
'niger' backwards is 'regin'.
'regin' going around 'o' is 'REGION'.
'this' is the link.
Can you help me to learn more?
(Other definitions for region that I've seen before include "Ignore (anag) - area" , "Area, domain" , "Area - district" , "Wide area" , "Area, zone" .)