Gore Vidal's "___ Breckinridge" (4)
I believe the answer is:
myra
'gore vidal's breckinridge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for myra that I've seen before include "Girl's name" , "- - Breckenridge (novel)" , "Girl" , "Woman's name, anagram of army" , "Dame --- Hess; Vidal's Breckinridge" .)