The Clue 40 under 40, say
The Answer LIST
The clue "40 under 40, say" refers to a list of people who are recognized for their achievements before turning 40 years old. In this context, "LIST" is the answer because it describes the collection of names featured in such rankings. These lists celebrate young leaders, innovators, or influential figures in various fields. So, "LIST" perfectly matches the idea of highlighting notable individuals under the age of 40.