Cryptic crossword clue
Fashion in setter’s slum shows lack of delicacy 9

The most common and most likely answer to this crossword clue is the 9 letter word IMMODESTY

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "lack of delicacy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lack of delicacy = immodesty.
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 IMMODESTY mean?

IMMODESTY noun
  1. The state of being immodest; a lack of modesty.

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