Benefit from rise in old savings account (5)
I believe the answer is:
asset
'benefit' is the definition.
(I've seen this before)
'rise in old savings account' is the wordplay.
'rise in' shows that the letters should be reversed in order.
'old savings account' becomes 'TESSA' (short for tax-exempt special savings account).
'tessa' in reverse letter order is 'ASSET'.
'from' is the link.
(Other definitions for asset that I've seen before include "Tessa (anag)" , "One bringing benefit" , "Useful or valuable property" , "Plus point" , "Useful item" .)