How many letters does the top answer for “the act of hindering or obstructing or impeding” have?

The most common answer is hindrance (9 letters).

Crossword clue: the act of hindering or obstructing or impeding

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

hindrance 9 letters wn-def

the act of hindering or obstructing or impeding

interference 12 letters wn-def

the act of hindering or obstructing or impeding