Fruit a mile off (4)
I believe the answer is:
lime
'fruit' is the definition.
(lime is a kind of fruit)
'a mile off' is the wordplay.
'off' indicates anagramming the letters.
'mile' anagrammed gives 'LIME'.
(Other definitions for lime that I've seen before include "Mailed item" , "Hang about in Jamaica" , "Tree, linden or citrus" , "Yellowish-green" , "Bright light green" .)