Staff try tropical fruit (5)
I believe the answer is:
mango
'tropical fruit' is the definition.
(I've seen this before)
'staff try' is the wordplay.
'staff' becomes 'man' (as in staffing or manning a particular place).
'try' becomes 'go' (both can mean an attempt).
'man'+'go'='MANGO'
(Other definitions for mango that I've seen before include "Type of fruit" , "No, Mag has the odd fruit" , "Fleshy tropical fruit" , "Tropical fruit, its pickle" , "fruit tree" .)