Crossword Genius

The worst cars from 1986? (5)

Ross

I believe the answer is:

dregs

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'the worst' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dregs that I've seen before include "What's left" , "Sediment - rabble" , "Residue of drink" , "Dross" , "Lees - riffraff" .)

I've seen this clue in The Independent.
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