An abbreviation of automotive relevance (3)

I believe the answer is:

mot

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'an abbreviation' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'of automotive relevance' is the wordplay.
'of' says the answer is hidden in the clue.
'MOT' can be found hidden inside 'automotive relevance'.

Can you help me to learn more?

(Other definitions for mot that I've seen before include "Witty saying" , "Witty words" , "Clever remark" , "Irish girlfriend" , "French word for Tom" .)

I've seen this clue in the Evening Standard.

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