How many letters does the top answer for “confined usually by illness” have?

The most common answer is homebound (9 letters).

Crossword clue: confined usually by illness

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

homebound 9 letters wn-def

people who are confined to their homes

housebound 10 letters wn-def

confined usually by illness

confined to bed (by illness) 50% similar → bedfast, bedrid, bedridden