How many letters does the top answer for “highly unusual or rare but not the single instance” have?

The most common answer is unique (6 letters).

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Crossword clue: highly unusual or rare but not the single instance

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

unique 6 letters wn-def

highly unusual or rare but not the single instance

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)