Cryptic crossword clue
Arm joint more grubby when one’s fallen 13

The most common and most likely answer to this crossword clue is the 13 letter word KNUCKLEDUSTER

K
N
U
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K
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D
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R

Buddy explains!

The straight part
We know that "Arm" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case arm = knuckleduster.
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 KNUCKLEDUSTER mean?

KNUCKLEDUSTER noun
  1. A weapon made of metal worn around the knuckles that strengthens the impact of a punch; brass knuckles.

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