Cryptic crossword clue
Aggressive type bringing trouble to worker, idiot at the top 9

The most common and most likely answer to this crossword clue is the 9 letter word ASSAILANT

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Aggressive type" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aggressive type = assailant.
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 ASSAILANT mean?

ASSAILANT noun
  1. Someone who attacks or assails another violently, or criminally.
  2. (by extension) A hostile critic or opponent.
ASSAILANT adjective
  1. Assailing; attacking.

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