Crossword Genius

Dispatched railway guard (6)

Ross

I believe the answer is:

sentry

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

'dispatched railway' is the wordplay.
'dispatched' becomes 'sent' (I've seen this in another clue).
'railway' becomes 'ry' (abbreviation).
'sent'+'ry'='SENTRY'

(Other definitions for sentry that I've seen before include "Watchperson" , "Watchman" , "Person standing watch" , "Military guard" , "One posted on guard" .)

I've seen this clue in The Telegraph.
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