Michael Ball's island? (4)

I believe the answer is:

elba

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

'island?' is the definition.
(Italian island)

'michael ball's' is the wordplay.
'ELBA' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for elba that I've seen before include "Napoleon prison isle" , "Napoleon's exile isle" , "Napoleon exile island" , "Island off Tuscany" , "Where emperor was confined" .)

I've seen this clue in the Evening Standard.

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