The term 'SUBSTITUTE's place' can be solved by the word 'STEAD', which is a five-letter word. The word 'STEAD' is an old English word that means a place or position held by someone else, usually in the absence of the original holder. It is often used to refer to a SUBSTITUTE teacher who takes the place of a regular teacher. In this context, it can also refer to any other type of SUBSTITUTE, such as a SUBSTITUTE worker or a SUBSTITUTE for a missing item.