The most common and most likely answer to this crossword clue is the 11 letter word CENTRIFUGAL
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Buddy explains!

The straight part
We know that "moving away from the middle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case moving away from the middle = centrifugal.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 CENTRIFUGAL mean?
CENTRIFUGAL noun- A rotating machine used to separate massecuite into sugar crystals and molasses.
- Tending, or causing, to recede from the center.
- Expanding first at the summit, and later at the base, as a flower cluster.
- Having the radicle turned toward the sides of the fruit, as some embryos.