How many letters does the top answer for “something superior in quality or condition or effect” have?

The most common answer is better (6 letters).

Crossword clue: something superior in quality or condition or effect

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

better 6 letters wn-def

(comparative of `good') superior to another (of the same class or set or kind) in excellence or quality or desirability