Found answer in Greek isle (6)
I believe the answer is:
create
'found' is the definition.
(to found is to establish or create)
'answer in greek isle' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'in' indicates putting letters inside.
'greek isle' becomes 'Crete' (I've seen this in another clue).
'a' placed into 'crete' is 'CREATE'.
(Other definitions for create that I've seen before include "Concoct" , "Produce from nothing" , "Compose" , "Make a fuss (colloq.)" , "found" .)