Herb sachet (7,5)
I believe the answer is:
bouquet garni
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">herb sachet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bouquet garni that I've seen before include "Bunch of herbs for stew" , "Herb sachet" , "Small bag of herbs - quaint brogue (anag)" , "Herb bunch in stew" , "stew flavouring" .)