A winner in odd parts of this Pacific island (6)
I believe the answer is:
tahiti
'pacific island' is the definition.
(Tahiti is in the Pacific Ocean)
'a winner in odd parts of this' is the wordplay.
'winner' becomes 'hit' (both can mean a successful creative venture).
'in' indicates putting letters inside.
'odd parts of' means one should take alternating letters (letters in odd-numbered positions).
The alternate letters of 'this' are 'ti'.
'a'+'hit'='ahit'
'ahit' inserted within 'ti' is 'TAHITI'.
(Other definitions for tahiti that I've seen before include "Main island of society group, capital Papeete" , "Society member" , "Pacific island, the largest in French Polynesia" , "I hit at the tropical island" , "South Pacific island where both Robert Louis Stevenson and Paul Gauguin spent time" .)