How many letters does the top answer for “added to complete or make up a deficiency” have?

The most common answer is supplemental (12 letters).

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Crossword clue: added to complete or make up a deficiency

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

supplemental 12 letters wn-def

added to complete or make up a deficiency

supplementary 13 letters wn-def

added to complete or make up a deficiency

Pattern

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