Basil sauce (5)
I believe the answer is:
pesto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">basil sauce</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 pesto that I've seen before include "Italian sauce containing basil" , "Saucy work" , "Sauce of basil, pine nuts and garlic" , "Basic sauce" , "Pasta sauce mainly of basil and cheese" .)