Receives inside information about savings (4,3)
I believe the answer is:
nest egg
'savings' is the definition.
(nest egg can mean someone's savings)
'receives inside information about' is the wordplay.
'receives' becomes 'gets' ('get' can be a synonym of 'receive').
'inside' means one lot of letters goes inside another.
'information' becomes 'gen' (gen can informally mean information).
'about' is a reversal indicator.
'gets' going inside 'gen' is 'ggetsen'.
'ggetsen' back-to-front is 'NEST-EGG'.
(Other definitions for nest egg that I've seen before include "Saved-up money" , "Sum of money put by as a reserve" , "Sum saved for the future" , "Money laid aside for some future eventuality" , "Savings for the future" .)