Crossword Genius

Fat to drop into liquid (5)

Ross

I believe the answer is:

plump

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'fat' is the definition.
(I know that fat can be written as plump)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for plump that I've seen before include "Chubby, round" , "Rather fat" , "Full of figure" , "Not obese, just pleasantly rounded" , "Chubby, fat" .)

I've seen this clue in the Sydney Morning Herald.
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