Cryptic crossword clue
One dreadful scene eclipses another in process of aging 10

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

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

The straight part
We know that "process of aging" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case process of aging = senescence.
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 SENESCENCE mean?

SENESCENCE noun
  1. The state or process of ageing, especially in humans; old age.
  2. Ceasing to divide by mitosis because of shortening of telomeres or excessive DNA damage.
  3. Old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time.
  4. Fruit senescence, leading to ripening of fruit.
  5. (of a cell) Condition when the cell ceases to divide.

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