Crossword Genius

Beethoven's hearing aid reduced temperature somehow (3-7)

Ross

I believe the answer is:

ear-trumpet

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

'beethoven's hearing aid' is the definition.
I can't judge whether this definition defines the answer.

'reduced temperature somehow' is the wordplay.
'reduced' means to remove the last letter.
'somehow' is an anagram indicator.
'temperature' with its final letter taken away is 'temperatur'.
'temperatur' anagrammed gives 'EAR-TRUMPET'.

Can you help me to learn more?

I've seen this clue in The Independent.
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