Inter Milan gutted to be out (6)
I believe the answer is:
entomb
'inter' is the definition.
(I know that inter can be written as entomb)
'milan gutted to be out' is the wordplay.
'gutted' says to hollow out the word (remove centre letters) (to gut something is to remove its insides).
'out' indicates an anagram (out can mean wrong or inaccurate).
'milan' with its centre taken out is 'mn'.
'mn'+'to'+'be'='mntobe'
'mntobe' anagrammed gives 'ENTOMB'.
(Other definitions for entomb that I've seen before include "Bury, place in a crypt" , "to finish Aida, for example" , "Bury in vault" , "dispose of the dead" , "Place a dead body in a vault" .)