Cryptic crossword clue
County participated in game called unimportant 10

The most common and most likely answer to this crossword clue is the 10 letter word DOWNPLAYED

I've seen this crossword clue in The Sunday Telegraph
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Buddy explains!

The straight part
We know that "called unimportant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case called unimportant = downplayed.
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 DOWNPLAYED mean?

DOWNPLAYED verb
  1. To de-emphasize; to present or portray as less important or consequential.

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