One with business on a Balearic island (5)
I believe the answer is:
ibiza
'balearic island' is the definition.
(I've seen this before)
'one with business on a' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with business' becomes 'biz' (biz is a kind of business. I am not sure about the 'with' bit.**).
'on' means one lot of letters go next to another.
'i'+'biz'+'a'='IBIZA'
Can you help me to learn more?
(Other definitions for ibiza that I've seen before include "Clubbers' island" , "A Balearic 5 across" , "resort island" , "holiday destination" , "One of the Balearic Islands" .)