___ Gerritsen, author of medical and crime thrillers (4)

I believe the answer is:

tess

(Other definitions for tess that I've seen before include "'Justice' finally done on her (Hardy)" , "Ill-starred Hardy heroine" , "20 heroine" , "D'Urbeville heroine" , "Hardy's Durbeyfield heroine" .)

I've seen this clue in The New York Times.

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