How many letters does the top answer for “a person of inflexible integrity or fidelity.” have?

The most common answer is trueblue (8 letters).

Crossword clue: a person of inflexible integrity or fidelity.

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

trueblue 8 letters web-def

Of inflexible honesty and fidelity; -- a term derived from the true, or Coventry, blue, formerly celebrated for its unch