The term 'IT MAY BE HAIR-RAISING' can be solved by the six-letter word 'MOUSSE'. MOUSSE is a type of hair product that is used to give hair volume and texture. It is often used to create hairstyles that are voluminous and have a lot of body. The term 'hair-raising' is often used to describe something that is exciting or thrilling, so the term could be interpreted as a reference to the effect that MOUSSE has on hair.