Cryptic crossword clue
Fractions of number in choppers to put on uniform on board 12

The most common and most likely answer to this crossword clue is the 12 letter word SEVENTEENTHS

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Fractions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fractions = seventeenths.
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 SEVENTEENTHS mean?

SEVENTEENTHS noun
  1. One of seventeen equal parts of a whole.
  2. An interval of two octaves and a third.

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