How many letters does the top answer for “a possibility due to a favorable combination of circumstances” have?

The most common answer is chance (6 letters).

Crossword clue: a possibility due to a favorable combination of circumstances

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

chance 6 letters wn-def

a possibility due to a favorable combination of circumstances

opportunity 11 letters wn-def

a possibility due to a favorable combination of circumstances