Crossword Genius

Imperial Oil brand (4)

Ross

I believe the answer is:

esso

'imperial oil brand' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for esso that I've seen before include "Standard Oil (abbrev.)" , "An ExxonMobil trade name" .)

I've seen this clue in The A.V Club, the L.A. Times Daily and The Washington Post.
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