How many letters does the top answer for “something that precedes and indicates the approach of something or someone” have?

The most common answer is forerunner (10 letters).

Crossword clue: something that precedes and indicates the approach of something or someone

forerunner, harbinger, precursor.

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

forerunner 10 letters wn-def

something that precedes and indicates the approach of something or someone

harbinger 9 letters wn-def

something that precedes and indicates the approach of something or someone

precursor 9 letters wn-def

something that precedes and indicates the approach of something or someone