Politician kidnapped by two black militants (4)

I believe the answer is:

impi

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'black militants' is the definition.
The definition suggests a singular noun which matches the answer.

'politician kidnapped by two' is the wordplay.
'politician' becomes 'MP' (Member of Parliament).
'kidnapped by' indicates putting letters inside.
'two' becomes 'II' (Roman numerals).
'mp' inserted into 'ii' is 'IMPI'.

Can you help me to learn more?

(Other definitions for impi that I've seen before include "group of fighting men" , "Zulu warrior tribe" , "warrior band" , "Old warriors" , "fighters" .)

I've seen this clue in The Independent.

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