Cryptic crossword clue
Decay in iron I cut from neat arrangement 9

The most common and most likely answer to this crossword clue is the 9 letter word FETIDNESS

I've seen this crossword clue in The Guardian
F
E
T
I
D
N
E
S
S

Buddy explains!

The straight part
We know that "Decay" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case decay = fetidness.
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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