Why one sees red inside Range Rover? (5)

I believe the answer is:

anger

I'm a little stuck... Click here to teach me more about this clue!

'why one sees red' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'inside range rover?' is the wordplay.
'inside' indicates a hidden word.
'ANGER' is hidden in the letters of 'range rover'.

Can you help me to learn more?

(Other definitions for anger that I've seen before include "Deadly sin" , "Wrath; annoy" , "Spleen" , "Greatly annoy" , "Hostile feeling" .)

I've seen this clue in The Sun.

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