Cryptic crossword clue
Movement involving church developed real increase in speed 12

The most common and most likely answer to this crossword clue is the 12 letter word ACCELERATION

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Buddy explains!

The straight part
We know that "increase in speed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case increase in speed = acceleration.
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 ACCELERATION mean?

ACCELERATION noun
  1. The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration.
  2. The amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).
  3. The change of velocity with respect to time (can include deceleration or changing direction).
  4. The advancement of students at a rate that places them ahead of where they would be in the regular school curriculum.

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