Cod's cousin (4)
I believe the answer is:
hake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cod's cousin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hake that I've seen before include "Common food fish" , "Type of fish" , "Cod-like fish" , "Food fish related to the cod" , "Food fish; rhymes with create" .)