Sea nymphs (7)
I believe the answer is:
nereids
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sea nymphs</span>' is the definition.<br/ ><span class="explanation-format__explanation">(nymphs in Greek myth)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nereids that I've seen before include "Mythological sea nymphs" , "Need, sir, could produce seanymphs" , "Group of nymphs" .)