I believe the answer is:
cran
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'ocean spray prefix' is the definition. This is all the clue.
(I've seen this in another clue)
(Other definitions for cran that I've seen before include "Herring measure" , "quantity of herrings" , "Unit for measuring fresh herrings" , "Old measure of fresh herrings" , "Measuring unit for fresh herring" .)
I've seen this clue in the LA Times, The Wall Street Journal and The New York Times.
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