Bulb (5)
I believe the answer is:
onion
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bulb</span>' is the definition.<br/ ><span class="explanation-format__explanation">(plant bulb)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for onion that I've seen before include "Bulb used in cooking" , "veggie" , "Tear-inducing edible bulb" , "one understood by expert" , "it can bring tears" .)