Twice a year, wife brings fruit (6)
I believe the answer is:
pawpaw
'fruit' is the definition.
(pawpaw is a kind of fruit)
'twice a year wife' is the wordplay.
'twice' shows that letters should be duplicated.
'a year' becomes 'pa' (per annum).
'wife' becomes 'w'.
'pa'+'w'='paw'
'paw' doubled is 'PAWPAW'.
'brings' is the link.
(Other definitions for pawpaw that I've seen before include "foul once" , "Custard apple tree" , "Papaya" , "Fruit" .)