Colour adds nothing to scope (6)

I believe the answer is:

orange

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'colour' is the definition.
(orange is a kind of colour)

'nothing to scope' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to scope' becomes 'range' (synonyms).
'o'+'range'='ORANGE'

'adds' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for orange that I've seen before include "Fruit; pigment" , "Dutch royal house" , "One's pipped" , "Kind of sauce" , "Go earn the fruit" .)

I've seen this clue in The Irish News.

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