The term 'CERTAIN MYSTIQUE' can be broken down into two words, 'CERTAIN' and 'MYSTIQUE'. The word 'CERTAIN' is defined as being definite or sure, while 'MYSTIQUE' is defined as a mysterious quality or atmosphere. When combined, the term 'CERTAIN MYSTIQUE' can be interpreted as having a definite, mysterious quality or atmosphere. This can be further explained by the crossword solution of 'AURA', which is defined as a distinctive atmosphere or feeling that surrounds a person or place. Therefore, the term 'CERTAIN MYSTIQUE' can be described as having a definite, mysterious atmosphere or feeling that surrounds it.