Blair of "The Exorcist" (5)
I believe the answer is:
linda
'blair of the exorcist' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for linda that I've seen before include "girl" , "-- Gray, 'Dallas' star" , "Girl's name (I, not Y)" , "23 [LOVELACE]" , "lady" .)