Enamel is an enigma for Pacific islander (10)

I believe the answer is:

melanesian

I'm a little stuck... Click here to teach me more about this clue!

'pacific islander' is the definition.
The definition suggests a singular noun which matches the answer.

'enamel is an enigma' is the wordplay.
'enamel is an' can be anagrammed to 'MELANESIAN'.
Though, I am not clear how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for melanesian that I've seen before include "Relating to one group of Pacific islands" , "Perhaps Fijian" .)

I've seen this clue in the Sydney Morning Herald.

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