A Roman law is nominally Russian (6)

I believe the answer is:

alexis

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'nominally russian' is the definition.
The definition suggests a singular noun which matches the answer.

'a roman law is' is the wordplay.
'roman law' becomes 'lex' ('law' in Latin).
'a'+'lex'+'is'='ALEXIS'

Can you help me to learn more?

(Other definitions for alexis that I've seen before include "man or woman" , "Lia's ex has another name" .)

I've seen this clue in The Globe and Mail.

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