Lot more shaky -- this sound? (7)
I believe the answer is:
tremolo
'this sound?' is the definition.
(tremolo is a kind of sound)
'lot more shaky' is the wordplay.
'shaky' indicates anagramming the letters.
'lot'+'more'='lotmore'
'lotmore' anagrammed gives 'TREMOLO'.
(Other definitions for tremolo that I've seen before include "Vibrato effect" , "Musical wavering effect" , "Musical shake" , "Quivering musical effect" , "Wavering effect in music" .)