How many letters does the top answer for “the office or duty of a trustee.” have?

The most common answer is trusteeship (11 letters).

Crossword clue: the office or duty of a trustee.

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

trusteeship 11 letters web-def

the position of trustee

office or duty of a custodian. 50% similar → custodianship

office or duty of an advocate. 50% similar → advocateship

the office duty of a trierarch. 50% similar → trierarchy