Dark purple fruit (4)
There are a few possibilities for this:
elderberry
'dark purple fruit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sloe that I've seen before include "Thorny bush with plum-like fruit" , "Sour blue-black fruit" , "Sour blackthorn fruit" , "Fruit often used for gin" , "Blackthorn, used in making a type of gin" .)
'dark purple fruit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acai that I've seen before include "South American food product" , "South American palm tree" , "fruit which is nutritious" , "something nutritional to eat" .)
(Other definitions for elderberry that I've seen before include "Fruit used for cordial" , "Winemaker" , "Fruit used to make wine" , "A blue-black fruit" , "Fruit used for jelly or wine" .)