The most common and most likely answer to this crossword clue is the 4 letter word BOSH
B
O
S
H
More clues leading to the result BOSH
Buddy explains!
The straight part
We know that "Rats!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rats! = bosh.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 BOSH mean?
BOSH noun- Nonsense.
- An expression of disbelief or annoyance.
- The lower part of a blast furnace, between the hearth and the stack.
- A figure.
- An expression of speedy and satisfactory completion of a simple or straightforward task.
- To consume (illicit drugs).