Staff leave fruit ... (5)
I believe the answer is:
mango
'fruit' is the definition.
(type of fruit)
'staff leave' is the wordplay.
'staff' becomes 'man' (as in staffing or manning a particular place).
'leave' becomes 'go' (to go is to depart or leave).
'man'+'go'='MANGO'
(Other definitions for mango that I've seen before include "No, Mag has the odd fruit" , "fruit-tree" , "Tropical fruit, its pickle" , "Yellow-fleshed fruit" , "Large oval tropical fruit" .)