How many letters does the top answer for “a brownish yellow color.” have?

The most common answer is isabella (8 letters).

Crossword clue: a brownish yellow color.

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

isabella 8 letters web-def

the queen of Castile whose marriage to Ferdinand of Aragon in 1469 marked the beginning of the modern state of Spain; th

of a medium to dark brownish yellow color 60% similar → amber

a deep yellow color 50% similar → amber, gold

a strong yellow color 50% similar → gamboge, maize

of a light brownish color 50% similar → sorrel