Cryptic crossword clue
Serving as correction, speed of light accelerating 10

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

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Serving as correction" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case serving as correction = chastening.
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 CHASTENING mean?

CHASTENING verb
  1. To punish (in order to bring about improvement in behavior, attitude, etc.); to restrain, moderate.
  2. To make chaste; to purify.
  3. To punish or reprimand for the sake of improvement; to discipline.
  4. To render humble or restrained; to restrain or moderate.
CHASTENING noun
  1. The act by which somebody is chastened.

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