How many letters does the top answer for “a color varying from dark purplish brown to dark red” have?

The most common answer is puce (4 letters).

Crossword clue: a color varying from dark purplish brown to dark red

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

puce 4 letters wn-def

a color varying from dark purplish brown to dark red

a dark purplish-red color 67% similar → claret

a dark purplish-red to blackish-red color 57% similar → burgundy

a dark brown color 50% similar → mocha