Spearfish (6)
I believe the answer is:
marlin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spearfish</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for marlin that I've seen before include "Large ocean fish" , "Large game fish" , "Prized game fish" , "Spearfish" , "Large sea-fish" .)