Go to the ball upset about the world (6)
I believe the answer is:
global
'the world' is the definition.
(I've seen this before)
'go to the ball upset' is the wordplay.
'to' says to put letters next to each other (I've seen this in other clues).
'upset' is an anagram indicator.
'go' put after 'ball' is 'ballgo'.
'ballgo' is an anagram of 'GLOBAL'.
'about' is the link.
(Other definitions for global that I've seen before include "Shaped like a sphere or ball" , "everywhere" , "Relating to the whole world" , "Of the whole world, worldwide" , "blanket" .)