Cryptic crossword clue
Big brat in for treatment, being very gassy

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

I've seen this crossword clue in The Times
R
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Buddy explains!

The straight part
We know that "being very gassy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being very gassy = rabbiting.
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 RABBITING mean?

RABBITING verb
  1. To hunt rabbits.
  2. To flee.
RABBITING verb
  1. To talk incessantly and in a childish manner; to babble annoyingly.

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