Mother of Galahad (6)
I believe the answer is:
elaine
'mother of galahad' 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 ""The lily maid of Astolat"" , "-- Paige, singer" , "Girl" , "Name" , "Mother of sir Galahad" .)