Come unstuck about team in country (6)
I believe the answer is:
mexico
'country' is the definition.
(Mexico is an example)
'come unstuck about team' is the wordplay.
'unstuck' indicates an anagram.
'about' is an insertion indicator.
'team' becomes 'xi' (eleven, a football team).
'come' anagrammed gives 'meco'.
'meco' going around 'xi' is 'MEXICO'.
'in' acts as a link.
(Other definitions for mexico that I've seen before include "Land of the Aztecs" , "North American republic" , "North American country" , "Country south of USA" , "It borders US to south" .)