Crossword Genius

Soldier's opening door for lookout (6)

Ross

I believe the answer is:

sentry

'lookout' is the definition.
(synonyms)

'soldier's opening door' is the wordplay.
'opening' suggests taking the first letters.
'door' becomes 'entry' (synonyms).
The initial letter of 'soldiers' is 's'.
's'+'entry'='SENTRY'

'for' is the link.

(Other definitions for sentry that I've seen before include "One posted on guard" , "Watchman" , "Lookout soldier" , "Military guard" , "Person posted to keep watch for some anticipated event" .)

I've seen this clue in The Telegraph.
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