Cryptic crossword clue
First-class old mini-dwelling ending with the National Trust 9

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

I've seen this crossword clue in The Daily Telegraph
E
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Buddy explains!

The straight part
We know that "First-class" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case first-class = excellent.
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 EXCELLENT mean?

EXCELLENT adjective
  1. Having excelled, having surpassed.
  2. Of higher or the highest quality; splendid.
  3. Exceptionally good of its kind.
  4. Superior in kind or degree, irrespective of moral quality.
EXCELLENT adverb
  1. Excellently.

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