Crossword Genius

Butter sub (4)

Ross

I believe the answer is:

oleo

'butter sub' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Penny Press.
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