Chap to leave some food (5)
I believe the answer is:
mango
'some food' is the definition.
(mango is a kind of food)
'chap to leave' is the wordplay.
'chap' becomes 'man' (chap can mean a man).
'to leave' becomes 'go' (to go is to depart or leave).
'man'+'go'='MANGO'
(Other definitions for mango that I've seen before include "Large oval tropical fruit" , "Fruit, often in chutney" , "Fleshy tropical fruit" , "Type of fruit" , "Ovoid edible fruit" .)