Soup green (3)
I believe the answer is:
pea
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">soup</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(pea soup is a kind of soup)</span><br/ ><br/ >'<span class="explanation-format__original">green</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(pea green is a kind of green)</span><br/ ><br/ ></span>
(Other definitions for pea that I've seen before include "Climbing plant; vegetable" , "It grows in 23 Down" , "Edible green seed" , "It grows in a pod" , "veg" .)