Gets inside information, turning up savings (4,3)
I believe the answer is:
nest egg
'savings' is the definition.
(nest egg can mean someone's savings)
'gets inside information turning up' is the wordplay.
'inside' is an insertion indicator.
'information' becomes 'gen' (gen can informally mean information).
'turning up' is a reversal indicator.
'gets' going into 'gen' is 'ggetsen'.
'ggetsen' written backwards gives 'NEST-EGG'.
(Other definitions for nest egg that I've seen before include "Money set aside for retirement" , "Fund for a rainy day" , "Savings for the future" , "Sum of money saved, as bird would" , "a little money?" .)