Cryptic crossword clue
Level of assistance mostly found in European prisoner 7

The most common and most likely answer to this crossword clue is the 7 letter word ECHELON

I've seen this crossword clue in Financial Times
E
C
H
E
L
O
N


Buddy explains!

The straight part
We know that "Level" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case level = echelon.
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 ECHELON mean?

ECHELON noun
  1. A level or rank in an organization, profession, or society.
  2. A line of riders seeking maximum drafting in a crosswind, resulting in a diagonal line across the road.
  3. A formation of troops, ships, etc., in diagonal parallel rows.
ECHELON verb
  1. To form troops into an echelon.
ECHELON adjective
  1. Of a matrix: having undergone Gaussian elimination with the result that the leading coefficient or pivot (that is, the first nonzero number from the left) of a nonzero row is to the right of the pivot of the row above it, giving rise to a stepped appearance in the matrix.

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