Go after the guy for the fruit (5)
I believe the answer is:
mango
'the fruit' is the definition.
(type of fruit)
'go after the guy' is the wordplay.
'after' means one lot of letters go next to another.
'the guy' becomes 'man' (guy can informally mean a man).
'go' put after 'man' is 'MANGO'.
'for' is the link.
(Other definitions for mango that I've seen before include "Fruit, often in chutney" , "No, Mag has the odd fruit" , "Fleshy tropical fruit" , "Type of fruit" , "Once exotic fruit" .)