Biblical weed (4)
I believe the answer is:
tare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">biblical weed</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 tare that I've seen before include "Vessel's weight" , "Common vetch" , "Variety of vetch" , "Allowance made for the weight of the container in which goods are packed" , "Vetch plant" .)