Crossword Genius

My sweet nothings (5)

Ross

I believe the answer is:

ducks

I'm a little stuck... Click here to teach me more about this clue!

'nothings' is the definition.
The definition and answer can be both quantities as well as being plural nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ducks that I've seen before include "Eg, mallards" , "Birds with webbed feet" , "Swimming birds with scores of nothing?" , "More than one aquatic bird" , "My pet" .)

I've seen this clue in the Evening Standard.
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