The most common and most likely answer to this crossword clue is the 9 letter word FOREBODES
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Buddy explains!

The straight part
We know that "Warns of bad outcome" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case warns of bad outcome = forebodes.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.
Crossword Answer definitions
FOREBODES verb- To predict a future event; to hint at something that will happen (especially as a literary device).
- To be prescient of (some ill or misfortune); to have an inward conviction of, as of a calamity which is about to happen; to augur despondingly.