The crossword solution for the term 'PARTNERSHIP OBSTACLE' is EGO, which is a three-letter word. EGO is defined as an individual's sense of self-esteem or self-importance. It can be seen as an obstacle to successful partnerships because it can lead to selfishness and a lack of consideration for others. When EGO gets in the way of a partnership, it can cause tension and conflict, making it difficult to reach a successful outcome.