How many letters does the top answer for “of the brown color of rust” have?

The most common answer is rusty (5 letters).

Crossword clue: of the brown color of rust

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

rusty 5 letters wn-def

of the brown color of rust

a dark brown color 50% similar → mocha

make brown in color 50% similar → embrown

of a yellowish brown color 50% similar → khaki