Cryptic crossword clue
Judge of diamond finished holding its middle 3

The most common and most likely answer to this crossword clue is the 3 letter word UMP

U
M
P

Buddy explains!

The straight part
We know that "Judge of diamond" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case judge of diamond = ump.
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 UMP mean?

UMP noun
  1. An umpire.
UMP verb
  1. To act as an umpire.

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