Crossword Genius

Poison oak relative (5)

Ross

I believe the answer is:

sumac

(Other definitions for sumac that I've seen before include "Shrub bright in autumn" , "Shrub colourful in Autumn" , "Hairy-fruited rhus" , "Novelist" , "Tree or shrub; reverse of French writer" .)

I've seen this clue in the Universal.
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