Launce (4,3)
I believe the answer is:
sand eel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">launce</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sand eel that I've seen before include "Very small fish that burrows into beaches" , "Shallow-water fish" , "swimmer" .)