A PET PROJECT is a PROJECT that someone works on for personal enjoyment or satisfaction, rather than for professional gain. The term 'PET PROJECT' can be used to describe any type of PROJECT, from a hobby to a business venture. In this case, the crossword solution for the term PET PROJECT is CHIA, which is a type of plant that is often grown as a houseplant or in gardens. CHIA plants are known for their ability to thrive in a variety of conditions and require minimal care.