Niger's corrupt rule (5)

I believe the answer is:

reign

'rule' is the definition.
(reign is a kind of rule)

'niger's corrupt' is the wordplay.
'corrupt' is an anagram indicator.
'niger' is an anagram of 'REIGN'.

(Other definitions for reign that I've seen before include "Predominance" , "period in power" , "Period of a monarchy" , "Monarch's period" , "Wield the sceptre" .)

I've seen this clue in The Telegraph.

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