Father to cough up a fruit (6)
I believe the answer is:
papaya
'fruit' is the definition.
(I know that papaya is a type of fruit)
'father to cough up a' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'to cough up' becomes 'pay' (I've seen this in another clue).
'pa'+'pay'+'a'='PAPAYA'
(Other definitions for papaya that I've seen before include "Tropical yellow fruit" , "Tropical fruit tree used in medicine" , "Tree with orange-fleshed fruit and black seeds" , "Caribbean fruit" , "Large, green West Indian fruit" .)