Crossword Genius

They're the least one expects from most of the relatives in cars (8)

Ross

I believe the answer is:

minimums

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'cars' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

'they're the least one expects from most of the relatives' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'relatives' could be 'mums' (mum is a kind of relative) and 'mums' is found within the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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