Terrible snore can echo, causing vibration (9)
I believe the answer is:
resonance
'vibration' is the definition.
(resonance is a kind of vibration)
'terrible snore can echo' is the wordplay.
'terrible' is an anagram indicator.
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'snore'+'can'='snorecan'
'snorecan' anagrammed gives 'resonanc'.
'resonanc'+'e'='RESONANCE'
'causing' acts as a link.
(Other definitions for resonance that I've seen before include "Vibrancy" , "Sound amplification" , "Sympathetic vibration" , "Sonority" , "Deep, clear, ringing quality" .)