Costner or Kline (5)
I believe the answer is:
kevin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">costner or kline</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for kevin that I've seen before include "Man's name" , "Mr Keegan?" , "- Costner, US actor (Dances with Wolves)" .)