Fruit, nasty by the sound of it? (4)
I believe the answer is:
ugli
'fruit' is the definition.
(I know that Ugli is a fruit)
'nasty by the sound of it?' is the wordplay.
'nasty' becomes 'ugly' (I've seen this in another clue).
'by the sound of it?' shows a homophone (sound like).
'ugly' sounds like 'UGLI'.
(Other definitions for ugli that I've seen before include "Hybrid fruit, sounds nasty" , "Jamaican form of 6" , "Trademark name for a hybrid citrus fruit" , "Large juicy fruit with thick wrinkled skin" , "Black/violet element" .)