The term 'not a team player' can be summarized by two crossword solutions: LONER (5 letters) and REF (3 letters). A LONER is someone who prefers to be alone and avoids social interaction, while a REF is short for referee, which is someone who enforces the rules of a game. Therefore, someone who is not a team player could be described as a LONER who does not follow the rules, or a referee who does not enforce them.