Quality of sound initially leaves one shaken (7)

I believe the answer is:

timbrel

I'm a little stuck... Click here to teach me more about this clue!

'one shaken' is the definition.
I can't tell whether this defines the answer.

'quality of sound initially leaves' is the wordplay.
'quality of sound' becomes 'timbre' (I've seen this before).
'initially' suggests taking the first letters.
The initial letter of 'leaves' is 'l'.
'timbre'+'l'='TIMBREL'

Can you help me to learn more?

(Other definitions for timbrel that I've seen before include "Biblical percussion instrument" , "Hand drum" , "old instrument" .)

I've seen this clue in The Times.

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