Islander exchanged information for a fool (6)
I believe the answer is:
cretan
'islander' is the definition.
(someone from Crete)
'exchanged information for a fool' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cretan that I've seen before include "One from Greece's largest island" , "A Mediterranean islander" , "Island nationality of citizen of Heraklion" , "Native of Minoan island" , "Native of Greek island south of mainland (6)" .)