Comedian Kevin (4)
I believe the answer is:
hart
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">comedian kevin</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 hart that I've seen before include "providing material for Richard Rodgers?" , "Richard Rodgers and Lorenz . . . . were famous musical partnership" , "Male red-deer" , "Songwriting partnership, Rodgers and --" , "Mature male deer" .)