The most common and most likely answer to this crossword clue is the 8 plus 7 letter word SECURITY COUNCIL
I've seen this crossword clue in The Times
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More clues leading to the result SECURITY COUNCIL
- International body in US, iconic, involved with cruelty
- International committee pledge advice may be listened to
- UN institution cruel cynic is out to change
- New version of iconic clueneeded for New York based body
- Kent urban authority welcomes the return of game’s international body
- Assembly in guardroom? Not exactly!
Buddy explains!

The straight part
We know that "International body" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case international body = security council.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.