Note that makes us tremble! (6)
I believe the answer is:
quaver
This could be a double definition.
'note that makes us' is the first definition.
'quaver' can be an answer for 'note' (musical note). I am not certain of the remainder of the definition.
'tremble' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for quaver that I've seen before include "(Of voice) tremble" , "Tremble; musical note" , ".Speak in a trembling voice" , "Shake; a short note" , "Half-crotchet" .)