The most common and most likely answer to this crossword clue is the 4 plus 2 plus 6 letter word BANG TO RIGHTS
I've seen this crossword clue in The Times
B
A
N
G
T
O
R
I
G
H
T
S
More clues leading to the result BANG TO RIGHTS
Buddy explains!
The straight part
We know that "caught in the act" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case caught in the act = bang to rights.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.