How many letters does the top answer for “to set upon; to attack.” have?

The most common answer is aggress (7 letters).

Crossword clue: to set upon; to attack.

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

aggress 7 letters web-def

take the initiative and go on the offensive