The term 'TARGET MOUSE' is a combination of two words, with the first word being 'TARGET' and the second word being 'MOUSE'. The crossword solution for this term is 'ICON', which is a four-letter word. An ICON is a small graphical representation of an object, action, or idea. It is often used in computer programs and websites to help users quickly identify and access certain features. In the context of TARGET MOUSE, an ICON could be used to represent the MOUSE itself, or the action of clicking on it.