Retirement fund (4,3)
I believe the answer is:
nest egg
'retirement fund' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nest egg that I've seen before include "Money kept in reserve" , "Money saved for the future" , "a little money?" , "Money laid aside for some future eventuality" , "Money set aside for retirement" .)