Galahad's mother (6)
I believe the answer is:
elaine
'galahad's mother' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elaine that I've seen before include "Mother of sir Galahad" , "Girl" , "Name" , "-- Paige, singer" , "-- Paige, singer/actress" .)