Ocean Spray prefix (4)
I believe the answer is:
cran
'ocean spray prefix' is the definition.
(I've seen this in another clue)
This is all the 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" .)