The most common and most likely answer to this crossword clue is the 9 letter word VOYEURISM
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Buddy explains!
The straight part
We know that "morbid interest in sordid sights" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case morbid interest in sordid sights = voyeurism.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 VOYEURISM mean?
VOYEURISM noun- The derivation of sexual satisfaction by watching people secretly, especially when those being watched are undressed or engaging in sexual activity.
- (by extension) The derivation of satisfaction by obsessively watching or following sensational or sordid subjects.