Open global body had nothing to hide outside of negligence (10)
I believe the answer is:
unfastened
'open' is the definition.
(similar in meaning)
'global body had nothing to hide outside of negligence' is the wordplay.
'global body' becomes 'UN' (United Nations).
'had nothing' becomes 'fasted' (I've seen this in another clue).
'to hide' means one lot of letters goes inside another.
'outside of' says to hollow out the word (remove centre letters) (only letters on the outside of the word).
'negligence' with its middle taken out is 'ne'.
'fasted' going around 'ne' is 'fastened'.
'un'+'fastened'='UNFASTENED'
(Another definition for unfastened that I've seen is " Undone".)