Pompeo of "Grey's Anatomy" (5)
I believe the answer is:
ellen
'pompeo of grey's anatomy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ellen that I've seen before include "the Lady of the Lake" , "- Terry, Eng. actress" , "Dame - Terry, English actress" , "Girl's name" , "English actress, ____ Terry (1847-1928)" .)