On the road, a dangerous gear change (4)

I believe the answer is:

rage

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

'on the road a dangerous' is the definition.
I can't tell whether this defines the answer.

'gear change' is the wordplay.
'change' indicates anagramming the letters.
'gear' anagrammed gives 'RAGE'.

Can you help me to learn more?

(Other definitions for rage that I've seen before include "Fad or anger" , "High dudgeon" , "Frenzy" , "spread rapidly" , "Fashionable" .)

I've seen this clue in the Evening Standard.

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