Cryptic crossword clue
Banned officer with one boring existence in team 12

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

I've seen this crossword clue in Financial Times
D
I
S
Q
U
A
L
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F
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D

Buddy explains!

The straight part
We know that "Banned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case banned = disqualified.
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 DISQUALIFIED mean?

DISQUALIFIED verb
  1. To make ineligible for something.
  2. To exclude from consideration by the explicit revocation of a previous qualification.

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