Kingsley or Martin (4)
I believe the answer is:
amis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kingsley or martin</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 amis that I've seen before include "Kingsley, Martin or John" , "Author of Lucky Jim, d.1995" , "Martin --, Eng. author" , "English writer" , "Kingsley -, English author (Lucky Jim)" .)