How many letters does the top answer for “acting with less concern for yourself than for the success of the joint activity” have?

The most common answer is selflessness (12 letters).

Crossword clue: acting with less concern for yourself than for the success of the joint activity

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

selflessness 12 letters wn-def

acting with less concern for yourself than for the success of the joint activity