Cryptic crossword clue
Iron, acid and double nitrogen found in maize 6,4

The most common and most likely answer to this crossword clue is the 6 plus 4 letter word INDIAN CORN

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

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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.

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