Cryptic crossword clue
With day fading, idol facing riot breaking out in festivity 13

The most common and most likely answer to this crossword clue is the 13 letter word GLORIFICATION

I've seen this crossword clue in Independent
G
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Buddy explains!

The straight part
We know that "festivity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case festivity = glorification.
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 GLORIFICATION mean?

GLORIFICATION noun
  1. The act of glorifying or the state of being glorified.
  2. Specifically, the ascension (of Christ or humans) to the glory of heaven.
  3. The worshiping of a deity; extolment or laudation.
  4. The portrayal of something as being ideal; idealization.

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