The most common and most likely answer to this crossword clue is the 9 letter word SMELLIEST
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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 SMELLIEST mean?
SMELLIEST adjective- Having a bad smell.
- Having a quality that arouses suspicion.
- (in extreme programming) Having signs that suggest a design problem; having a code smell.