Son receives inside information over savings (4,4)

I believe the answer is:

nest-eggs

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'savings' is the definition.
(I've seen this before)

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

(Other definitions for nest-eggs that I've seen before include "Funds put by as reserves" , "Funds put by for the future" , "Small savings for a rainy day" , "Moneys saved for future use - by birds?" , "Funds put by in reserve" .)

I've seen this clue in The Telegraph.

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