Gathers in information to back savings (4,3)
I believe the answer is:
nest egg
'savings' is the definition.
(nest egg can mean someone's savings)
'gathers in information to back' is the wordplay.
'gathers' becomes 'gets' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'information' becomes 'gen' (gen can informally mean information).
'to back' is a reversal indicator.
'gets' placed inside 'gen' is 'ggetsen'.
'ggetsen' backwards is 'NEST-EGG'.
Can you help me to learn more?
(Other definitions for nest egg that I've seen before include "Sum of money saved, as bird would" , "Retirement savings" , "Reserve funds" , "Sum saved for the future" , "Money kept in reserve" .)