Iceberg, for instance (7)
I believe the answer is:
lettuce
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">iceberg for instance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that iceberg lettuce is a type of lettuce)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lettuce that I've seen before include "Salad leaves" , "Salad green" , "Cos or iceberg?" , "food" , "E.g. cos" .)