Cryptic crossword clue
The lift is out of order, being most dirty 9

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

I've seen this crossword clue in The Guardian
F
I
L
T
H
I
E
S
T

Buddy explains!

The straight part
We know that "most dirty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most dirty = filthiest.
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 FILTHIEST mean?

FILTHIEST adjective
  1. Covered with filth; very dirty.
  2. Obscene or offensive.
  3. Very unpleasant or disagreeable.

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