Save? Get cross about worthless pieces here? (7,8)
I believe the answer is:
bargain basement
'worthless pieces here?' is the definition.
The definition suggests a singular noun which matches the answer.
'save? get cross about' is the wordplay.
'save?' becomes 'bar' (both can mean 'except').
'get' becomes 'gain' (gaining is a kind of getting).
'cross about' becomes 'basement' (I can't explain this - if you can you should give a lot more credence to this answer).
'bar'+'gain'+'basement'='BARGAIN-BASEMENT'
Can you help me to learn more?
(Other definitions for bargain basement that I've seen before include "Place for special offers" , "down here...snip!" .)