Father goes on foot for fruit (5)
I believe the answer is:
papaw
'for fruit' is the definition.
(papaw is a kind of fruit)
'father goes on foot' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'goes on' says to put letters next to each other.
'foot' becomes 'paw' (paw is a kind of foot).
'pa'+'paw'='PAPAW'
(Other definitions for papaw that I've seen before include "Papaya" , "Custard apple" , "fruit tree" , "seedy article" .)