Blue Bonnet, for one (4)

I believe the answer is:

oleo

'blue bonnet for one' 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" , "Prefix indicating oily" , "Oil used in making margarine" , "Marge" .)

I've seen this clue in the Universal and the Penny Press.

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