Backward-looking

I think it could be either:

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5 13

'backward-looking' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for retro that I've seen before include "Backward looking" , "Imitating a style from the recent past" , "Old-fashioned style" , "Fashion of yesteryear" , "bit of nostalgia" .)

I've seen this clue in The Wall Street Journal.

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