Cryptic crossword clue
Oil know-how picked up in northern India 6

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

I've seen this crossword clue in The Times
N
E
R
O
L
I

Buddy explains!

The straight part
We know that "Oil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case oil = neroli.
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 NEROLI mean?

NEROLI noun
  1. More fully neroli oil or oil of neroli: an essential oil distilled from the blossoms of the bitter orange or Seville orange (Citrus × aurantium subsp. amara) used to make perfumes.

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