Cryptic crossword clue
Ancient Greek nickel possessed by world sports organization 5

The most common and most likely answer to this crossword clue is the 5 letter word IONIC

I
O
N
I
C


Buddy explains!

The straight part
We know that "Ancient Greek" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ancient greek = ionic.
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.

What does IONIC mean?

IONIC adjective
  1. Of, relating to, or containing ions

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