New melody regarded as a good thing, generally (5,3)
I believe the answer is:
fresh air
'a good thing generally' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'new melody' is the wordplay.
'new' becomes 'fresh' (synonyms).
'melody' becomes 'air' (air can mean a tune or melody).
'fresh'+'air'='FRESH AIR'
'regarded as' acts as a link.
Can you help me to learn more?
(Other definitions for fresh air that I've seen before include "that's found outside" , "Type of fiend" .)