Black boxer the greatest in island (4)

I believe the answer is:

bali

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'greatest in island' is the definition.
'Bali' can be an answer for 'island' (Indonesian island). I'm unsure of the 'greatest in' bit.

'black boxer' is the wordplay.
'black' becomes 'b' (abbreviation as in pencil hardness).
'boxer' becomes 'Ali' (Muhammad Ali).
'b'+'ali'='BALI'

'the' is the link.

Can you help me to learn more?

(Other definitions for bali that I've seen before include "Bail out of the island" , "mountainous island" , "Javanese island" , "Indonesian holiday destination" , "Indonesian island, capital Denpasar" .)

I've seen this clue in The Sun.

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