Cryptic crossword clue
Feared criminal controlling syndicate testified again 10

The most common and most likely answer to this crossword clue is the 10 letter word REAFFIRMED

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The straight part
We know that "testified again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case testified again = reaffirmed.
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 REAFFIRMED mean?

REAFFIRMED verb
  1. To affirm again.
  2. To bolster or support.

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