Crossword Genius

Petro-Canada alternative (4)

Ross

I believe the answer is:

esso

'petro-canada alternative' 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 "An ExxonMobil trade name" , "Standard Oil (abbrev.)" .)

I've seen this clue in The Wall Street Journal.
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