International organisation searched for something unnecessary (8)
I believe the answer is:
unwanted
'unnecessary' is the definition.
(thesaurus)
'international organisation searched' is the wordplay.
'international organisation' becomes 'UN' (United Nations).
'searched' becomes 'wanted' (wanting is a kind of searching).
'un'+'wanted'='UNWANTED'
'for something' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for unwanted that I've seen before include "Outcast" , "Superfluous" , "Left over" , "Not needed" , "redundant" .)