What does the cryptic crossword clue "Metal charm found in Northern Ireland? I'm not sure (7)" mean?

The definition is "Metal". The wordplay uses a charade (building blocks). NI (synonym="abbreviation for Northern Ireland") + OBI (synonym="a charm used in Afro-Caribbean witchcraft") + UM (synonym="an expression of uncertainty = I’m not sure") = NIOBIUM; definition: "Metal" The answer is NIOBIUM.

Metal charm found in Northern Ireland? I'm not sure (7)

Independent Cryptic #11694 | 13 Across | 2024-04-03 flower

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