Cryptic crossword clue
12 Unexpected noise, dirt, cause one to lose sense of direction 9

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

I've seen this crossword clue in Financial Times
D
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Buddy explains!

The straight part
We know that "cause one to lose sense of direction" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cause one to lose sense of direction = disorient.
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 DISORIENT mean?

DISORIENT verb
  1. To cause to lose orientation or direction.
  2. To confuse or befuddle.

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