In Islam, he correctly is Abraham’s first son (7)

I believe the answer is:

ishmael

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'son' is the definition.
(I have seen 'Son of Abraham ' mean 'ishmael' so perhaps 'son' could also mean 'ishmael')

'in islam he correctly is abraham's first' is the wordplay.
'islam he' anagrams to 'ISHMAEL'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for ishmael that I've seen before include "'''Call me ...'' (first words of Moby Dick) (7)'" , "he survived wreck of whaler" , "The outcast of Genesis hails me" , "Bellicose sort" , "Narrator of Moby-Dick" .)

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

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