The most common and most likely answer to this crossword clue is the 4 letter word UTAS
U
T
A
S
Buddy explains!
The straight part
We know that "Lost eight days of a festival," is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lost eight days of a festival, = utas.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.