Husband in Soviet Union a cavalryman once (6)

I believe the answer is:

hussar

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'cavalryman once' is the definition.
I can't judge whether this defines the answer.

'husband in soviet union a' is the wordplay.
'husband' becomes 'h' (abbreviation).
'in' indicates putting letters inside.
'soviet union' becomes 'USSR' (synonyms).
'ussr' enclosing 'a' is 'ussar'.
'h'+'ussar'='HUSSAR'

Can you help me to learn more?

(Other definitions for hussar that I've seen before include "Hungarian soldier" , "Early Hungarian cavalry man" , "Light cavalryman" , "Member of a light cavalry regiment" , "Cavalryman, originally Hungarian" .)

I've seen this clue in The Times.

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