The most common and most likely answer to this crossword clue is the 11 letter word REPRIMANDED
I've seen this crossword clue in The Daily Telegraph
R
E
P
R
I
M
A
N
D
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D
More clues leading to the result REPRIMANDED
Buddy explains!

The straight part
We know that "Taken to task" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case taken to task = reprimanded.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 REPRIMANDED mean?
REPRIMANDED verb- To reprove in a formal or official way.