The most common and most likely answer to this crossword clue is the 4 plus 5 letter word BACK ALLEY
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More clues leading to the result BACK ALLEY
Buddy explains!

The straight part
We know that "sordid location" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sordid location = back alley.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 BACK ALLEY mean?
BACK ALLEY adjective- Occurring away from publicity, or in mean surroundings; backstreet