Crossword Genius

One who foils trespassers? (6)

Ross

I believe the answer is:

fencer

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'one who foils trespassers?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for fencer that I've seen before include "Maker of barriers; user of foil" , "One using foil, epee" , "secures a boundary" , "Sporty type" , "A sportsman with swords" .)

I've seen this clue in The Globe and Mail and The Guardian.
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