The most common and most likely answer to this crossword clue is the 6 plus 4 letter word YELLOW CARD
Y
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More clues leading to the result YELLOW CARD
- Shout with pain, with heart maybe leading to caution in game
- The Spanish engaged in cowardly playing leading to referee's sanction
- Caution shown when playing king, fearful scoundrel nicking it?
- Caution, cowardly character!
- New York taxi driver’s first caution
- Cry with pain, as scoundrel receives royal warning
- Cowardly eccentric shows caution
- Official warning cowardly joker, say
- Chicken-hearted eccentric’s official warning
- Cry out in pain — case for caution
Buddy explains!

The straight part
We know that "caution" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case caution = yellow card.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 YELLOW CARD mean?
YELLOW CARD verb- To show someone a yellow card