The most common and most likely answer to this crossword clue is the 8 letter word BAWDIEST
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Buddy explains!

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 BAWDIEST mean?
BAWDIEST adjective- Soiled, dirty.
- Obscene; filthy; unchaste.
- (of language) Sexual in nature and usually meant to be humorous but considered rude.