Fruit of zero scope (6)
I believe the answer is:
orange
'fruit' is the definition.
(I know that orange is a type of fruit)
'zero scope' is the wordplay.
'zero' becomes 'O' (O resembles 0).
'scope' becomes 'range' (synonyms).
'o'+'range'='ORANGE'
'of' is the link.
(Other definitions for orange that I've seen before include "A rainbow colour" , "Colour of an onager?" , "Princely house" , "Colour of Northern Ireland unionism" , "soft drink?" .)