That's the Spirit is an expression used to show encouragement and support. It is often used when someone has done something brave or admirable, and it is meant to show appreciation for their effort. The crossword solution for this term is GHOST, which is a five-letter word. GHOST can refer to the spirit of a deceased person, or it can refer to something that is intangible or hard to see. In this case, it is likely referring to the spirit of encouragement and support that the phrase That's the Spirit conveys.