Crossword Genius

Protein source for Ripple milk (3)

Ross

I believe the answer is:

pea

(Other definitions for pea that I've seen before include "The plant is a strange ape" , "Small vegetable" , "Climber" , "It grows in 23 Down" , "Cause of a princess's insomnia?" .)

I've seen this clue in the Universal.
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