How many letters does the top answer for “a member of a council.” have?

The most common answer is councilor (9 letters).

Crossword clue: a member of a council.

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

councilor 9 letters web-def

A member of a council. [Written also councillor.]

a man who is a council member 67% similar → councilman

a woman who is a council member 67% similar → councilwoman

the position of council member 67% similar → councillorship