Name by which St Petersburg, Russia was known from 1924-91 (9)

I believe the answer is:

leningrad

(Other definitions for leningrad that I've seen before include "St Petersburg formerly" , "Soviet city now St Petersburg" , "Former name of city" , "Name of St Petersburg from 1924 to 1991" , "St Petersburg some time ago" .)

I've seen this clue in The Mirror.

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