Crossword Genius

Fruit of theatrical conversation (7)

Ross

I believe the answer is:

rhubarb

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'fruit' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for rhubarb that I've seen before include "Meaningless talk" , "Vegetable used as fruit" , "Edible stem" , "Word repeated by actors to simulate conversation" , "Rheum rhaponticum" .)

I've seen this clue in The Globe and Mail.
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