How many letters does the top answer for “of a medium to dark brownish yellow color” have?

The most common answer is amber (5 letters).

Crossword clue: of a medium to dark brownish yellow color

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

amber 5 letters wn-def

a deep yellow color

a brownish yellow color. 60% similar → isabella

a medium brown to dark-brown color 50% similar → umber

a medium to dark tan color 50% similar → caramel