Crossword Genius

Guard; lookout (6)

Ross

I believe the answer is:

sentry

This clue is a double definition.

'guard' is the first definition.
(I know that sentry is a type of security guard)

'lookout' is the second definition.
(I know that lookout can be written as sentry)

(Other definitions for sentry that I've seen before include "One keeps watch" , "Sentinel, watch" , "Look-out, guard" , "Military guard" , "Person posted to keep watch for some anticipated event" .)

I've seen this clue in The Telegraph.
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