Margarine (4)

I believe the answer is:

oleo

'margarine' is the definition.
(I know that margarine can be written as oleo)

This is the entire clue.

(Other definitions for oleo that I've seen before include "Prefix indicating oily" , "Marge" , "Oil used in making margarine" , "Fatty substance" .)

I've seen this clue in The Star Tribune, the Penny Press, the King Feature Syndicate and The Wall Street Journal.

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