Chivalrous knight (7)
I believe the answer is:
paladin
'chivalrous knight' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for paladin that I've seen before include "Heroic knight - aid plan (anag)" , "Knightly champion" , "One of the twelve peers at Charlemagne's court - heroic champion" , "Historical knight" , "Chivalrous knight" .)