Crossword Genius

Lutetium region not completely developed in island (5)

Ross

I believe the answer is:

luzon

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'developed in island' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'lutetium region not completely' is the wordplay.
'lutetium' becomes 'Lu' (Lu is the chemical symbol for lutetium).
'region' becomes 'zone' (zone is a kind of region).
'not completely' means to remove the last letter.
'zone' with its last letter removed is 'zon'.
'lu'+'zon'='LUZON'

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