Crossword Genius

Sour sticks (7)

Ross

I believe the answer is:

rhubarb

(Other definitions for rhubarb that I've seen before include "Garden plant with reddish, edible stalks" , "bitter stuff" , "Noise of actors simulating conversation" , "The stems are edible when cooked, the leaves are poisonous" , "murmurings in the theatre" .)

I've seen this clue in The Guardian.
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