How many letters does the top answer for “excessive measure; the excess beyond true or proper measure; surplus.” have?

The most common answer is overmeasure (11 letters).

Crossword clue: excessive measure; the excess beyond true or proper measure; surplus.

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

overmeasure 11 letters web-def

To measure or estimate too largely.