Aware of melody above noise (5,2)
I believe the answer is:
tuned in
'aware' is the definition.
(tuned in can mean aware or alert)
'melody above noise' is the wordplay.
'melody' becomes 'tune' (synonyms).
'above' is a charade indicator (letters next to each other).
'noise' becomes 'din' (din can mean a loud noise or disturbance).
'tune'+'din'='TUNED IN'
'of' acts as a link.
(Other definitions for tuned in that I've seen before include "Prepared to hear" , "Adjusted radio set" .)