Crossword Genius

Fruity expressions of anger? (7)

Ross

I believe the answer is:

rhubarb

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This could be a double definition.

'fruity expressions of' is the first definition.
The definition suggests a singular noun which matches the answer.

'anger?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for rhubarb that I've seen before include "Word repeated by actors to simulate conversation" , "In America, heated dispute" , "Plant with fleshy reddish leaf-stalks used like fruit" , "Reddish leafstalks cooked and sweetened" , "confused mutter" .)

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