Huckleberry ____ (4)
I believe the answer is:
finn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">huckleberry</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Huckleberry Finn in novels by Mark Twain)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for finn that I've seen before include "hero of American fiction" , "eg Sibelius" , "National" , "Someone from Helsinki?" , "Trollope's Phineas; one from Tampere" .)