The most common and most likely answer to this crossword clue is the 11 letter word BRUTALITIES
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The straight part
We know that "cruel deeds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cruel deeds = brutalities.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 BRUTALITIES mean?
BRUTALITIES noun- The state of being brutal.
- A cruel or savage act.
- The use of excessive physical force, often in the form of violence.