Answer: EGO

Ego can be defined as a person's sense of self-importance or self-esteem. It is the part of a person's personality that thinks highly of oneself and seeks personal recognition, often at the expense of others. In the context of teamwork, ego can act as an inhibitor because it can lead individuals to prioritize their own interests, opinions, and achievements over the collective goals and well-being of the team.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Narcissist's flaw. Explanations are generated by AI and may be inaccurate.