The most common and most likely answer to this crossword clue is the 6 letter word FENCER
F
E
N
C
E
R
More clues leading to the result FENCER
- Provider of security, one using foil?
- Swordsman who puts up a barrier
- Sportsperson who might make pounds?
- Olympic sportsman who joins panels?
- Sporting type erecting barrier around field
- Run after criminal, an armed man
- Criminal dealer meets resistance fighter
- One may prefer sabre to foil criminal? Right
- Guard meets resistance from swordsman
- Swordsman in the Grand National?
Buddy explains!

The straight part
We know that "Swordsman/who puts up a barrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case swordsman/who puts up a barrier = fencer.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.