Cryptic crossword clue
English assimilated by Welshman a month back, disappeared 9

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

I've seen this crossword clue in The Guardian
E
V
A
N
E
S
C
E
D

Buddy explains!

The straight part
We know that "disappeared" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disappeared = evanesced.
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 EVANESCED mean?

EVANESCED verb
  1. To disappear into a mist or dissipate in vapor
  2. To transition from the solid state to gaseous state without ever becoming a liquid

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