International organisation work on stance with top diplomat so they're not challenged (9)
I believe the answer is:
unopposed
'not challenged' is the definition.
(without being challenged or opposed)
'international organisation work on stance with top diplomat so' is the wordplay.
'international organisation' becomes 'UN' (United Nations).
'work' becomes 'op' (abbreviation for opus).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'stance' becomes 'pose' (I've seen this in another clue).
'with top diplomat so' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'un'+'op'+'pose'+'d'='UNOPPOSED'
'they're' is the link.
Can you help me to learn more?
(Other definitions for unopposed that I've seen before include "Without resistance or other contenders" , "Elected . . . . . . . . .; no other candidate" , "Assembly" , "Nem con" , "so carried?" .)