Crossword Genius

At all costs dismiss call as coming from youngsters (4)

Ross

I believe the answer is:

tots

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'youngsters' is the definition.
(tot is a kind of youngster)

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

Can you help me to learn more?

(Other definitions for tots that I've seen before include "Little children" , "Finds the sum" , "Little drinks" , "Babies" , "Party drinks" .)

I've seen this clue in the Irish Times.
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