The term 'SIT FOR A SNAPSHOT' can be broken down into two parts: 'SIT FOR A' and 'SNAPSHOT'. The first part, 'SIT FOR A', can be solved by the four-letter word 'POSE'. This means to assume a particular position or attitude, usually FOR a photograph. The second part, 'SNAPSHOT', refers to a photograph taken quickly, often without preparation or posing. Therefore, the complete term 'SIT FOR A SNAPSHOT' can be interpreted as a request to assume a particular position or attitude FOR a photograph that is taken quickly.