Crossword Genius

Rhino saved for the next generation? (4,3)

Ross

I believe the answer is:

nest egg

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'rhino' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand the rest of the clue.

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(Other definitions for nest egg that I've seen before include "Money set aside for retirement" , "Savings for the future" , "a little money?" , "Retirement savings" , "Fund for a rainy day" .)

I've seen this clue in The Independent.
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