Chivalrous knight (7)
I believe the answer is:
paladin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chivalrous knight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)