The term BE PARTISAN can be broken down into three crossword solutions: SIDE (4 letters), SERB (4 letters), and TAKESIDES (9 letters). SIDE refers to a group of people with shared political beliefs or interests, such as a political party. SERB is an acronym for the Serbian Radical Party, a far-right political party in Serbia. TAKESIDES means to support one SIDE over another, usually in a political context. Therefore, BE PARTISAN can be interpreted as taking sides in a political conflict or supporting a particular political party.