Vegetable used in pies (7)

I believe the answer is:

rhubarb

(Other definitions for rhubarb that I've seen before include "making contribution to murmuring" , "Edible plant with fleshy reddish leaf-stalks (7)" , "Nonsense; plant with edible leaf stalks" , "Leaf stalks eaten stewed" , "rot" .)

I've seen this clue in The Washington Post.

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