Fellow with sound fruit tree (5)
I believe the answer is:
mango
'fruit tree' is the definition.
(mango is a kind of fruit tree)
'fellow with sound' is the wordplay.
'fellow' becomes 'man' (I've seen this before**).
'with' is a charade indicator (letters next to each other).
'sound' becomes 'go' ('go' can be a synonym of 'sound').
'man'+'go'='MANGO'
(Other definitions for mango that I've seen before include "Fleshy tropical fruit" , "Asian fruit" , "Ovoid edible fruit" , "No, Mag has the odd fruit" , "Yellow-fleshed fruit" .)