Engineers quietly broadcast sound again (8)
I believe the answer is:
repaired
'sound again' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'engineers quietly broadcast' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'quietly' becomes 'p' (p for piano and quiet).
'broadcast' becomes 'aired' (synonyms).
're'+'p'+'aired'='REPAIRED'
Can you help me to learn more?
(Other definitions for repaired that I've seen before include "Put right - went" , "Mended, restored" , "Restored to good condition" , "Fixed" , "Retired" .)