Crossword Genius

Soldier on guard (6)

Ross

I believe the answer is:

sentry

'soldier on guard' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sentry that I've seen before include "One keeps guard" , "Lookout soldier" , "One keeps watch" , "Military lookout" , "Look-out, guard" .)

I've seen this clue in the Evening Standard, The Telegraph, The Times and The Mirror.
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