The term 'advantageous aspect' can be broken down into two crossword solutions: UPSIDE (6 letters) and PRO (3 letters). UPSIDE is a term used to describe the positive or beneficial aspects of something, while PRO is an abbreviation for the word 'PROFESSIONAL, ' which is often used to describe someone who is highly skilled in their field. Together, these two words suggest that the advantageous aspect in question is one that is beneficial and PROFESSIONAL.