Edible stems (7)
I believe the answer is:
rhubarb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">edible stems</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rhubarb that I've seen before include "An edible red stalk" , "Leaf-stalks eaten with crumble" , "Stalks edible when cooked" , "mutterings in the theatre" , "Reddish leafstalks cooked and eaten as fruit" .)