Answer: goodsport

AnswerCrossword Clue
GOODSPORTOne who plays along
GOODSPORTOne who is gracious in both victory and defeat
GOODSPORTSore loser's opposite
GOODSPORTSore loser's antithesis
GOODSPORTUnselfish participant, or a mercantile harbor
GOODSPORTGracious winner, e.g.