Cryptic crossword clue
Complete before the last part in which further progress is impossible 4,3

The most common and most likely answer to this crossword clue is the 4 plus 3 letter word DEAD END

I've seen this crossword clue in Financial Times
D
E
A
D
E
N
D


Buddy explains!

The straight part
We know that "in which further progress is impossible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in which further progress is impossible = dead end.
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 DEAD END mean?

DEAD END noun
  1. A road with no exit.
  2. (by extension) A position that offers no hope of progress.
DEAD END verb
  1. To come to a dead-end.
DEAD END adjective
  1. Going nowhere; blocked.

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