Model Holliday (4)
I believe the answer is:
tess
'model holliday' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tess that I've seen before include "tragic heroine" , "Hardy's Durbeyfield heroine" , "Thomas Hardy girl" , "Thomas Hardy heroine" , "'Justice' finally done on her (Hardy)" .)