Eileen —, actress who portrayed Lilian Bentley in 1991 film drama Let Him Have It (6)
I believe the answer is:
atkins
(Other definitions for atkins that I've seen before include "Doctor's diet much in the news" , "A modern diet" , "Tommy - - , private" , "Name associated with a diet rich in meat" , "Current diet fad that excludes carbohydrates" .)