Crossword Genius

Cause of a princess's insomnia (3)

Ross

I believe the answer is:

pea

(Other definitions for pea that I've seen before include "The plant is a strange ape" , "Ape this plant badly" , "Edible seed from pod" , "Ape this plant awkwardly" , "Legume" .)

I've seen this clue in the Universal.
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