What vibrates at end of canal heard rumbling somewhat (7)

I believe the answer is:

eardrum

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

'what vibrates at end' is the definition.
I can't tell whether this defines the answer.

'canal heard rumbling somewhat' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'EARDRUM' is hidden in the letters of 'canal heard rumbling'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for eardrum that I've seen before include "Aural membrane" , "Rude ram (anag.)" , "Tympanum" , "Ear membrane" , "Hearing membrane" .)

I've seen this clue in The Independent.

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