Continuing to sound (8)
I believe the answer is:
resonant
'continuing to sound' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for resonant that I've seen before include "Sonorous, full and rich in sound" , "Tending to reinforce sounds" , "Tending to prolong sound, echoing" , "Reverberating" , "Evocative or ringing" .)