Cryptic crossword clue
In addition, the Marines will be in tumult 11

The most common and most likely answer to this crossword clue is the 11 letter word FURTHERMORE

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Buddy explains!

The straight part
We know that "In addition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in addition = furthermore.
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 FURTHERMORE mean?

FURTHERMORE adverb
  1. In addition; besides; what's more; used to denote additional information.

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