Crossword Genius

Protect a railway employee (5)

Ross

I believe the answer is:

guard

I believe this clue is a double definition.

'protect' is the first definition.
(I know that guard is a kind of protect)

'a railway employee' is the second definition.
(I know that guard is a type of railway worker)

(Other definitions for guard that I've seen before include "Custodian" , "Protect(or)" , "Police" , "Sentry" , "Screw" .)

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