Gunpowder component
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gunpowder component</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 nitre that I've seen before include "Gunpowder ingredient" , "safeguard against decay" , "A part of fertilizer" , "Sodium nitrate" , "constituent of gunpowder" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gunpowder component</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>