The most common and most likely answer to this crossword clue is the 10 letter word RECITATIVE
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Buddy explains!
The straight part
We know that "Words sung" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case words sung = recitative.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 RECITATIVE mean?
RECITATIVE noun- Dialogue, in an opera etc, that, rather than being sung as an aria, is reproduced with the rhythms of normal speech, often with simple musical accompaniment or harpsichord continuo, serving to expound the plot
- Of a recital