Save to get a good deal (7)
I believe the answer is:
bargain
'a good deal' is the definition.
(I've seen this before)
'save to get' is the wordplay.
'save' becomes 'bar' (I've seen this before).
'to get' becomes 'gain' (gaining is a kind of getting).
'bar'+'gain'='BARGAIN'
(Other definitions for bargain that I've seen before include "Cheap purchase" , "Haggle; a good deal" , "Agreement, snip" , "Negotiate terms" , "Cheap acquisition" .)