The term 'ORGAN; BAD TEMPER' can be solved by the crossword clue 'SPLEEN' (6 letters). The SPLEEN is an organ located in the upper left side of the abdomen, and it is part of the lymphatic system. It is responsible for filtering out old and damaged red blood cells, as well as producing white blood cells that help fight infection. It is also believed to be associated with emotions, and a bad temper is one of the symptoms of an unhealthy SPLEEN.