How many letters does the top answer for “not restricted to one sect or school or party” have?

The most common answer is nonsectarian (12 letters).

Crossword clue: not restricted to one sect or school or party

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

nonsectarian 12 letters wn-def

not restricted to one sect or school or party

unsectarian 11 letters wn-def

not restricted to one sect or school or party