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"omen" is also used as a crossword clue. If that's what you saw, the answer is often harbinger (9 letters).
Definitions
indicate, as with a sign or an omen
Word origin
From Latin ōmen (“foreboding, omen”).
Used in a sentence
“The ghost's appearance was an ill omen.”
“A rise in imports might be an omen of economic recovery.”
“The egg has, during the span of history, represented mystery, magic, medicine, food and omen.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Portent”4 letters
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