The term 'Spartan and Seclusive' can be summed up by the crossword solution 'MONASTIC', which means living a solitary and ascetic lifestyle. Monasticism is an ancient practice that has been around since the 3rd century, and it is still practiced today in many religions. Monasticism involves living a life of prayer, contemplation, and service to others, while also abstaining from worldly pleasures. The term 'Spartan and Seclusive' is often used to describe this type of lifestyle, as it requires a great deal of discipline and self-control.