Engineer in USSR, a chap from Moscow? (7)

I believe the answer is:

russian

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'chap from moscow?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'engineer in ussr a' is the wordplay.
'engineer' indicates an anagram.
'in'+'ussr'+'a'='inussra'
'inussra' with letters rearranged gives 'RUSSIAN'.

Can you help me to learn more?

(Other definitions for russian that I've seen before include "Native of the world's largest country" , "Eg, Moscow native" , "Type of doll, dressing, or roulette" , "Countryman" , "Native of Vladivostok" .)

I've seen this clue in The Times.

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