What does the cryptic crossword clue "Unravelling of reign in African country (5)" mean?

The definition is "African country". The wordplay uses an anagram. anagram of REIGN = NIGER; definition: "African country" The answer is NIGER.

Unravelling of reign in African country (5)

Daily Mail Cryptic #17495 | 21 Down | 2024-11-22 flower