The most common and most likely answer to this crossword clue is the 6 letter word SAPPER
I've seen this crossword clue in The Guardian
S
A
P
P
E
R
More clues leading to the result SAPPER
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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 SAPPER mean?
SAPPER noun- One who saps; specifically, one who is employed in working at saps, building and repairing fortifications, and the like. Often known as a combat engineer or military engineer.
- An officer or private of the Royal Engineers.