Halite (4,4)
I believe the answer is:
rock salt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">halite</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rock salt that I've seen before include "flavouring" , "Mineral sodium chloride" , "Seasoning" , "mineral deposit" , "Halite" .)