Son of Lancelot (7)
I believe the answer is:
galahad
'son of lancelot' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for galahad that I've seen before include "Noble knight" , "Errant fellow" , "Chivalrous knight" , "Round Table knight destined to retrieve the Holy Grail" , "principled chap" .)