How many letters does the top answer for “a sudden and decisive change of government illegally or by force” have?

The most common answer is putsch (6 letters).

Crossword clue: a sudden and decisive change of government illegally or by force

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

putsch 6 letters wn-def

a sudden and decisive change of government illegally or by force

takeover 8 letters wn-def

a sudden and decisive change of government illegally or by force