Ringing tone's ran out (8)
I believe the answer is:
resonant
'ringing' is the definition.
(thesaurus)
'tone's ran out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'tones'+'ran'='tonesran'
'tonesran' with letters rearranged gives 'RESONANT'.
(Other definitions for resonant that I've seen before include "Continuing to sound clearly and deeply" , "Like" , "Deeply sounding" , "Tending to reinforce sounds" , "Evocative or ringing" .)