Two short pieces bearing fruit (6)
I believe the answer is:
pawpaw
'fruit' is the definition.
(pawpaw is a kind of fruit)
'two short pieces' is the wordplay.
'two' shows that letters should be duplicated.
'short pieces' becomes 'paw' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'paw' duplicated is 'PAWPAW'.
'bearing' is the link.
(Other definitions for pawpaw that I've seen before include "foul once" , "Papaya" , "Fruit" , "Custard apple tree" .)