Old-style railway employee sent up after blowing top (5)

I believe the answer is:

retro

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'old-style' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for retro that I've seen before include "Imitative of an older style" , "reminding us of the past" , "recreating the past for effect" , "suggestive of past" , "Fashion reminiscent of the past" .)

I've seen this clue in The Telegraph.

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