Crossword Genius

First go red and blue for example (7,6)

Ross

I believe the answer is:

primary colour

'red and blue for example' is the definition.

'first go' is the wordplay.
'first' becomes 'primary' ('primary' is associated in meaning with 'first').
'go' becomes 'colour' ('colour' as a verb, as in 'go red'**).
'primary'+'colour'='PRIMARY COLOUR'

I've seen this clue in The Telegraph.
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