Grp. of oil-producing nations (4)

I believe the answer is:

opec

(Other definitions for opec that I've seen before include "Group of countries with a common oil policy" , "price-fixers?" , "International oil-producing cartel" , "Cartel of oil-producing countries" , "Organisation intended to control the production and sale of petroleum" .)

I've seen this clue in the Universal and the Wall Street Journal.

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