The most common and most likely answer to this crossword clue is the 8 plus 1 letter word SCARLET} –
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Buddy explains!
The straight part
We know that "Sinful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sinful = scarlet} –.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 SCARLET} – mean?
SCARLET} – noun- A brilliant red colour tinged with orange.
- Cloth of a scarlet color.
- To dye or tinge with scarlet.
- Of a bright red colour.
- Sinful or whorish.
- (Ireland) Tragic or disappointing.