Crossword Genius

An edible marine gastropod of the genus Littorina (10)

Ross

I believe the answer is:

periwinkle

(Other definitions for periwinkle that I've seen before include "gastropod" , "Ornamental plant" , "This plant may be poisonous" , "Plant with five-petalled flowers" , "Tiny seafood item - purplish-blue shade" .)

I've seen this clue in The Independent.
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