Shade of zero scope (6)
I believe the answer is:
orange
'shade' is the definition.
(orange is a colour)
'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 "Royal house - fruit - colour" , "network" , "One's pipped" , "Fruit - part of the spectrum" , "Citrus fruit; colour" .)