How many letters does the top answer for “a system for classifying things into groups” have?

The most common answer is pigeonholing (12 letters).

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Crossword clue: a system for classifying things into groups

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

pigeonholing 12 letters wn-def

a system for classifying things into groups

Pattern

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