Shaking with fear, a soprano tackles a bit of Mozart (8)

I believe the answer is:

atremble

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'shaking with fear' is the definition.
I can't tell whether this defines the answer.

'a soprano tackles a bit of mozart' is the wordplay.
'soprano' becomes 'treble' (synonyms).
'tackles' indicates putting letters inside (tackle can mean to intercept or surround).
'a bit of' suggests taking the first letters.
The initial letter of 'mozart' is 'm'.
'treble' going around 'm' is 'tremble'.
'a'+'tremble'='ATREMBLE'

Can you help me to learn more?

(Another definition for atremble that I've seen is " quivering".)

I've seen this clue in The Independent.

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