How many letters does the top answer for “a way of access (upward and downward) consisting of a set of steps” have?

The most common answer is staircase (9 letters).

Crossword clue: a way of access (upward and downward) consisting of a set of steps

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

staircase 9 letters wn-def

a way of access (upward and downward) consisting of a set of steps

stairway 8 letters wn-def

a way of access (upward and downward) consisting of a set of steps