Crossword Genius

What you're right about the earl having on his car?

Ross

I think it could be either:

Which length description are you looking for?:

4,5

9*

rearlight

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'what you're right about the earl having on his car?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'right about the earl having on his car?' is the wordplay.
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'about' is an insertion indicator.
'having' says to put letters next to each other.
'on his car?' becomes 'igh' (I can't explain this - if you can you should believe this answer much more).
'earl'+'igh'='earligh'
'rt' enclosing 'earligh' is 'REAR-LIGHT'.

Can you help me to learn more?

(Another definition for rearlight that I've seen is " part of vehicle".)

I've seen this clue in the Evening Standard.
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