Guy to leave the fruit (5)
I believe the answer is:
mango
'fruit' is the definition.
(type of fruit)
'guy to leave' is the wordplay.
'guy' becomes 'man' (guy can informally mean a man).
'to leave' becomes 'go' (to go is to depart or leave).
'man'+'go'='MANGO'
'the' is the link.
(Other definitions for mango that I've seen before include "fruit tree" , "Tropical fruit, its pickle" , "Ovoid edible fruit" , "product" , "Large oval tropical fruit" .)