Settled upon Greek character's fruit (6)
I believe the answer is:
litchi
'fruit' is the definition.
(litchi is a kind of fruit)
'settled upon greek character's' is the wordplay.
'settled' becomes 'lit' (I've seen this before).
'upon' says to put letters next to each other.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'lit'+'chi'='LITCHI'
(Other definitions for litchi that I've seen before include "piece of fruit" , "Edible Chinese fruit" , "Asian tree" , "Chinese tree; its fruit" .)