The term 'clusterfist' is a combination of the words 'CLUSTER' and 'FIST, ' which refers to a type of fighting style that involves multiple punches thrown in quick succession. It is also known as 'CLUSTER punching, ' and is often used in martial arts and self-defense. The crossword solution for this term is 'MISER, ' which is someone who is extremely frugal or stingy with their money. This person is likely to hoard their wealth, rather than spending it on anything unnecessary.