Crossword Genius

Smallest portion left for banquet's starter (5)

Ross

I believe the answer is:

least

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'smallest' is the definition.
(synonyms)

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

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(Other definitions for least that I've seen before include "No more petty" , "Smallest, slightest" , "Lowest amount" , "Bottom" , "Steal (anag)" .)

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