Salve ingredient (4)
I believe the answer is:
aloe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">salve ingredient</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 aloe that I've seen before include "shrub" , "O, ale with bitter plant" , "Bitter drug from a leaf juice" , "Plant source of purgative drug" , "Genus of bitter herbs" .)