Kind of pearl (4)
I believe the answer is:
seed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kind of pearl</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for seed that I've seen before include "Plant reproducer" , "Pip; origin, beginning" , "people decline to go to" , "See 19" , "Biblical children" .)