Cryptic crossword clue
Reaction to Joker‘s line in casting 9

The most common and most likely answer to this crossword clue is the 9 letter word CHUCKLING

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Buddy explains!

The straight part
We know that "Reaction to Joker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reaction to joker = chuckling.
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 CHUCKLING mean?

CHUCKLING verb
  1. To laugh quietly or inwardly.
  2. To communicate through chuckling.
  3. To make the sound of a chicken; to cluck.
  4. To call together, or call to follow, as a hen calls her chickens; to cluck.
  5. To fondle; to indulge or pamper.
CHUCKLING noun
  1. (gerund of chuckle) An instance in which someone chuckles

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