Cryptic crossword clue
May look up advanced American oil 6

The most common and most likely answer to this crossword clue is the 6 letter word CANOLA

I've seen this crossword clue in Financial Times
C
A
N
O
L
A

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The straight part
We know that "American oil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case american oil = canola.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does CANOLA mean?

CANOLA noun
  1. Any of a number of cultivars of rapeseed (Brassica napus) and closely related field mustard (Brassica rapa), which have a lower erucic acid and glucosinolate content than traditional rapeseed.

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