Terrible noise made by alien undergoing torture (6)

I believe the answer is:

racket

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'terrible noise' is the definition.
'racket' can be an answer for 'noise' (racket is a kind of noise). I'm unsure of the 'terrible' bit.

'by alien undergoing torture' is the wordplay.
'by' is a charade indicator (letters next to each other).
'alien' becomes 'et' (extra terrestrial).
'undergoing torture' becomes 'rack' (I am not sure about this - if you are sure you should believe this answer much more).
'et' put after 'rack' is 'RACKET'.

'made' is the link.

Can you help me to learn more?

(Other definitions for racket that I've seen before include "Fraudulent scheme" , "Din, clamour" , "Lot of noise, or tennis bat" , "Dodgy business" , "Noise - tennis equipment" .)

I've seen this clue in The Guardian.

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