Money saved (4,3)

I think it could be either:

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4,3

nest egg

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

This is all the clue.

(Other definitions for nest egg that I've seen before include "Fund put by as a reserve" , "Money kept in reserve" , "Retirement savings" , "reserves" , "Money saved for a rainy day - by bird?" .)

I've seen this clue in the Penny Press, The Sun and The Telegraph.

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