Title role for Geena Davis (6)
I believe the answer is:
thelma
'title role for geena davis' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thelma that I've seen before include "-- and Louise, 1991 film" , "Louise's friend" , "Girl" , "Louise's partner" , "Woman" .)