Nice guy in suspect image upset island (8)
I believe the answer is:
tenerife
'island' is the definition.
(one of the Canary Islands)
'nice guy in suspect image upset' is the wordplay.
'nice guy' becomes 'rene' (common man's name in France - eg in Nice).
'in' is an insertion indicator.
'suspect image' becomes 'efit' (an e-fit is a police image of a suspect).
'upset' says the letters should be written in reverse.
'rene' inserted inside 'efit' is 'efirenet'.
'efirenet' reversed gives 'TENERIFE'.
(Other definitions for tenerife that I've seen before include "One of the Canary Islands" , "Fire teen off the island" , "Largest Canary island" , "There's an odd inter fee on the island" , "Popular holiday destination" .)