The most common and most likely answer to this crossword clue is the 5 letter word GALAS
I've seen this crossword clue in The Times
G
A
L
A
S
More clues leading to the result GALAS
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The straight part
We know that "Bashes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bashes = galas.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 GALAS mean?
GALAS noun- Pomp, show, or festivity.
- A showy and festive party.
- A member of an androgynous class of priests of the Sumerian goddess Inanna.