Poet Gallagher (4)
I believe the answer is:
tess
'poet gallagher' 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 "D'Urbeville heroine" , "Thomas Hardy heroine" , "- - of the d'Urbervilles" , "Lady" , "20 heroine" .)