Nursehound (7)
I believe the answer is:
dogfish
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nursehound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dogfish that I've seen before include "'Small shark, sounds canine (7)'" , "Nursehound" , "Small, edible shark" , "Restaurants call it rock salmon" .)