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.
Maybe there's a link between them I don't understand?

'of automotive relevance' is the wordplay.
'of' indicates a hidden word.
'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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