School did art in Caribbean island (8)
I believe the answer is:
trinidad
'caribbean island' is the definition.
(I've seen this before)
'school did art in' is the wordplay.
'school' indicates anagramming the letters (school can mean to improve or manipulate).
'did'+'art'+'in'='didartin'
'didartin' is an anagram of 'TRINIDAD'.
(Other definitions for trinidad that I've seen before include "Port of Spain island" , "West Indies island" , "English-speaking island off Venezuela" , "Caribbean island" , "Island linked to Tobago" .)