Double handle fruit (6)
I believe the answer is:
pawpaw
'fruit' is the definition.
(pawpaw is a kind of fruit)
'double handle' is the wordplay.
'double' shows that letters should be duplicated.
'handle' becomes 'paw' (I can't justify this - if you can you should give a lot more credence to this answer).
'paw' duplicated is 'PAWPAW'.
Can you help me to learn more?
(Other definitions for pawpaw that I've seen before include "Custard apple tree" , "foul once" , "Fruit" , "Papaya" .)