The term 'ON THE __ (FREE)' can be solved by the crossword solution 'HOUSE' which is a 5 letter word. This phrase is often used to describe a situation where someone is not paying for something, such as a service or product. It is usually used in the context of someone being allowed to stay somewhere without having to pay for it. For example, if someone was staying at a friend's HOUSE, they could say that they were 'on the HOUSE' meaning that they were not paying for their stay.