The term 'REALLY TOUGH TASK' can be summarized by the crossword solution of 'BEAR'. This is because a BEAR is an animal that is known for its strength and resilience, which are qualities that are often associated with completing a difficult task. Additionally, the phrase 'to BEAR something' is often used to describe the act of enduring a difficult situation or challenge. Therefore, the crossword solution of 'BEAR' is an appropriate way to summarize the term 'REALLY TOUGH TASK'.