Crossword Genius

Old-fashioned doorman powerless, on reflection (5)

Ross

I believe the answer is:

retro

'old-fashioned' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for retro that I've seen before include "Imitating an older style" , "Old-fashioned style" , "recreating the past for effect" , "Reminiscent of a past style" , "Describes the style of an earlier time, in short" .)

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