Knightly behaviour (8)
I believe the answer is:
chivalry
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">knightly behaviour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chivalry that I've seen before include "Knightly behaviour" , "Courtesy and consideration towards women, as from knights of old" , "Gallantry" , "Courtesy and kind behaviour towards weaker people" , "Almost defunct code of courtesy towards women" .)