The most common and most likely answer to this crossword clue is the 9 letter word PLAINSMAN
I've seen this crossword clue in Independent
P
L
A
I
N
S
M
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More clues leading to the result PLAINSMAN
Buddy explains!
The straight part
We know that "He’s on leve" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he’s on leve = plainsman.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 PLAINSMAN mean?
PLAINSMAN noun- A native, inhabitant or settler of a plains region, but especially of the United States prairies